## Henri PoincarĂ© was born on this day 162 years ago.

### Properties of the number 289869:

289869 = 3 × 23 × 4201 is a sphenic number and squarefree.289869 has 3 distinct prime factors, 8 divisors, 9 antidivisors and 184800 totatives.

289869 has a sphenic digit sum 42 in base 10.

289869 has an oblong digit sum 42 in base 10.

289869 = 144935

^{2}- 144934

^{2}= 48313

^{2}- 48310

^{2}= 6313

^{2}- 6290

^{2}= 2135

^{2}- 2066

^{2}is the difference of 2 nonnegative squares in 4 ways.

289869 is the difference of 2 positive pentagonal numbers in 2 ways.

289869 = 35

^{2}+ 88

^{2}+ 530

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

289869

^{2}= 69069

^{2}+ 281520

^{2}is the sum of 2 positive squares in 1 way.

289869

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

289869 is a divisor of 1013

^{12}- 1.

289869 = '289' + '869' is the concatenation of 2 semiprime numbers.

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