15979881 has 8 divisors (see below), whose sum is σ = 22559904. Its totient is φ = 10026560.

The previous prime is 15979879. The next prime is 15979889. The reversal of 15979881 is 18897951.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 15979881 - 2¹ = 15979879 is a prime.

It is a super-2 number, since 2×15979881² = 510713193548322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 15979881.

It is not an unprimeable number, because it can be changed into a prime (15979889) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 156615 + ... + 156716.

It is an arithmetic number, because the mean of its divisors is an integer number (2819988).

Almost surely, 2^15979881 is an apocalyptic number.

It is an amenable number.

15979881 is a deficient number, since it is larger than the sum of its proper divisors (6580023).

15979881 is a wasteful number, since it uses less digits than its factorization.

15979881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313351.

The product of its digits is 181440, while the sum is 48.

The square root of 15979881 is about 3997.4843339280. The cubic root of 15979881 is about 251.8785475469.

The spelling of 15979881 in words is "fifteen million, nine hundred seventy-nine thousand, eight hundred eighty-one".