## Gottfried Wilhelm Leibniz was born on this day 371 years ago.

### Properties of the number 890905:

890905 = 5 × 23 × 61 × 127 is the 820289^{th}composite number and is squarefree.

890905 has 4 distinct prime factors, 16 divisors, 23 antidivisors and 665280 totatives.

890905 has an emirp digit sum 31 in base 10.

Reversing the decimal digits of 890905 results in a sphenic number.

890905 = 445453

^{2}- 445452

^{2}= 89093

^{2}- 89088

^{2}= 19379

^{2}- 19356

^{2}= 7333

^{2}- 7272

^{2}= 3931

^{2}- 3816

^{2}= 3571

^{2}- 3444

^{2}= 1613

^{2}- 1308

^{2}= 1019

^{2}- 384

^{2}is the difference of 2 nonnegative squares in 8 ways.

890905 is the difference of 2 positive pentagonal numbers in 7 ways.

890905 = 25

^{2}+ 54

^{2}+ 942

^{2}is the sum of 3 positive squares.

890905

^{2}= 397256

^{2}+ 797433

^{2}= 160655

^{2}+ 876300

^{2}= 604647

^{2}+ 654304

^{2}= 534543

^{2}+ 712724

^{2}is the sum of 2 positive squares in 4 ways.

890905

^{2}is the sum of 3 positive squares.

890905 is a proper divisor of 1289

^{60}- 1.

890905 is palindromic in (at least) base -56.

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