655979 has 8 divisors (see below), whose sum is σ = 710208. Its totient is φ = 603520.

The previous prime is 655961. The next prime is 655987. The reversal of 655979 is 979556.

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 655979 - 2⁸ = 655723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (655909) 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, 389 + ... + 1209.

It is an arithmetic number, because the mean of its divisors is an integer number (88776).

2⁶⁵⁵⁹⁷⁹ is an apocalyptic number.

655979 is a deficient number, since it is larger than the sum of its proper divisors (54229).

655979 is a wasteful number, since it uses less digits than its factorization.

655979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 885.

The product of its digits is 85050, while the sum is 41.

The square root of 655979 is about 809.9253051980. The cubic root of 655979 is about 86.8887025296. Note that the first 3 decimals are identical.

The spelling of 655979 in words is "six hundred fifty-five thousand, nine hundred seventy-nine".