15978879 has 12 divisors (see below), whose sum is σ = 26377936. Its totient is φ = 9130752.

The previous prime is 15978871. The next prime is 15978881. The reversal of 15978879 is 97887951.

It is not a de Polignac number, because 15978879 - 2³ = 15978871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15978871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 126754 + ... + 126879.

Almost surely, 2^15978879 is an apocalyptic number.

15978879 is a deficient number, since it is larger than the sum of its proper divisors (10399057).

15978879 is a wasteful number, since it uses less digits than its factorization.

15978879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253646 (or 253643 counting only the distinct ones).

The product of its digits is 1270080, while the sum is 54.

The square root of 15978879 is about 3997.3590031419. The cubic root of 15978879 is about 251.8732828523.

The spelling of 15978879 in words is "fifteen million, nine hundred seventy-eight thousand, eight hundred seventy-nine".