979865 has 4 divisors (see below), whose sum is σ = 1175844. Its totient is φ = 783888.

The previous prime is 979831. The next prime is 979873. The reversal of 979865 is 568979.

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

It can be written as a sum of positive squares in 2 ways, for example, as 295936 + 683929 = 544^2 + 827^2 .

It is a cyclic number.

It is not a de Polignac number, because 979865 - 2¹⁴ = 963481 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 979865.

It is an unprimeable number.

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, 97982 + ... + 97991.

It is an arithmetic number, because the mean of its divisors is an integer number (293961).

2⁹⁷⁹⁸⁶⁵ is an apocalyptic number.

It is an amenable number.

979865 is a deficient number, since it is larger than the sum of its proper divisors (195979).

979865 is a wasteful number, since it uses less digits than its factorization.

979865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195978.

The product of its digits is 136080, while the sum is 44.

The square root of 979865 is about 989.8813060160. The cubic root of 979865 is about 99.3242776104.

The spelling of 979865 in words is "nine hundred seventy-nine thousand, eight hundred sixty-five".