15982979 has 4 divisors (see below), whose sum is σ = 15997800. Its totient is φ = 15968160.

The previous prime is 15982969. The next prime is 15983003. The reversal of 15982979 is 97928951.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 15982979 - 2⁴ = 15982963 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (15982919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5654 + ... + 7995.

It is an arithmetic number, because the mean of its divisors is an integer number (3999450).

Almost surely, 2^15982979 is an apocalyptic number.

15982979 is a deficient number, since it is larger than the sum of its proper divisors (14821).

15982979 is a wasteful number, since it uses less digits than its factorization.

15982979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14820.

The product of its digits is 408240, while the sum is 50.

The square root of 15982979 is about 3997.8718088503. The cubic root of 15982979 is about 251.8948236239.

It can be divided in two parts, 15982 and 979, that added together give a palindrome (16961).

The spelling of 15982979 in words is "fifteen million, nine hundred eighty-two thousand, nine hundred seventy-nine".