8515979 has 4 divisors (see below), whose sum is σ = 8790720. Its totient is φ = 8241240.

The previous prime is 8515967. The next prime is 8515993. The reversal of 8515979 is 9795158.

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 8515979 - 2⁸ = 8515723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8515909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137324 + ... + 137385.

It is an arithmetic number, because the mean of its divisors is an integer number (2197680).

Almost surely, 2^8515979 is an apocalyptic number.

8515979 is a deficient number, since it is larger than the sum of its proper divisors (274741).

8515979 is a wasteful number, since it uses less digits than its factorization.

8515979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274740.

The product of its digits is 113400, while the sum is 44.

The square root of 8515979 is about 2918.2150366277. The cubic root of 8515979 is about 204.2105589005.

The spelling of 8515979 in words is "eight million, five hundred fifteen thousand, nine hundred seventy-nine".