979857 has 10 divisors (see below), whose sum is σ = 1463858. Its totient is φ = 653184.

The previous prime is 979831. The next prime is 979873. The reversal of 979857 is 758979.

It can be written as a sum of positive squares in only one way, i.e., 571536 + 408321 = 756^2 + 639^2 .

It is not a de Polignac number, because 979857 - 2¹⁶ = 914321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (979807) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 5968 + ... + 6129.

2⁹⁷⁹⁸⁵⁷ is an apocalyptic number.

It is an amenable number.

979857 is a deficient number, since it is larger than the sum of its proper divisors (484001).

979857 is a wasteful number, since it uses less digits than its factorization.

979857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12109 (or 12100 counting only the distinct ones).

The product of its digits is 158760, while the sum is 45.

The square root of 979857 is about 989.8772651193. The cubic root of 979857 is about 99.3240073023.

The spelling of 979857 in words is "nine hundred seventy-nine thousand, eight hundred fifty-seven".