Number of the day: 48739

Properties of the number 48739:

48739 is a cyclic number.
48739 = 17 × 47 × 61 is a sphenic number and squarefree.
48739 has 3 distinct prime factors, 8 divisors, 13 antidivisors and 44160 totatives.
48739 has an emirp digit sum 31 in base 10.
48739 = 24370² - 24369² = 1442² - 1425² = 542² - 495² = 430² - 369² is the difference of 2 nonnegative squares in 4 ways.
48739 is the difference of 2 positive pentagonal numbers in 4 ways.
48739 = 7² + 27² + 219² is the sum of 3 positive squares.
48739² = 22936² + 43005² = 14805² + 46436² = 30315² + 38164² = 8789² + 47940² is the sum of 2 positive squares in 4 ways.
48739² is the sum of 3 positive squares.
48739 is a proper divisor of 1597⁴ - 1.
48739 = '4873' + '9' is the concatenation of 2 semiprime numbers.

The number 48739 belongs to the following On-Line Encyclopedia of Integer Sequences (OEIS) sequence (among others):

Sequence number and description below are taken from OEIS.
A185265: a(0)=1, a(1)=2; thereafter a(n) = f(n-1) + f(n-2) where f() = A164387().