915979 has 4 divisors (see below), whose sum is σ = 924976. Its totient is φ = 906984.

The previous prime is 915973. The next prime is 915991. The reversal of 915979 is 979519.

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 915979 - 2⁵ = 915947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (915973) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4344 + ... + 4549.

It is an arithmetic number, because the mean of its divisors is an integer number (231244).

2⁹¹⁵⁹⁷⁹ is an apocalyptic number.

915979 is a deficient number, since it is larger than the sum of its proper divisors (8997).

915979 is a wasteful number, since it uses less digits than its factorization.

915979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8996.

The product of its digits is 25515, while the sum is 40.

The square root of 915979 is about 957.0679181751. The cubic root of 915979 is about 97.1169807705.

The spelling of 915979 in words is "nine hundred fifteen thousand, nine hundred seventy-nine".