979731638 has 16 divisors (see below), whose sum is σ = 1502115840. Its totient is φ = 479043816.

The previous prime is 979731617. The next prime is 979731707. The reversal of 979731638 is 836137979.

It is a happy number.

979731638 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 979731638.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 131645 + ... + 138887.

It is an arithmetic number, because the mean of its divisors is an integer number (93882240).

Almost surely, 2^979731638 is an apocalyptic number.

979731638 is a deficient number, since it is larger than the sum of its proper divisors (522384202).

979731638 is a wasteful number, since it uses less digits than its factorization.

979731638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8731.

The product of its digits is 1714608, while the sum is 53.

The square root of 979731638 is about 31300.6651367028. The cubic root of 979731638 is about 993.1977131433.

The spelling of 979731638 in words is "nine hundred seventy-nine million, seven hundred thirty-one thousand, six hundred thirty-eight".