979640 has 32 divisors (see below), whose sum is σ = 2322000. Its totient is φ = 370944.

The previous prime is 979567. The next prime is 979651. The reversal of 979640 is 46979.

It is a happy number.

It is a zygodrome in base 7.

It is a self number, because there is not a number n which added to its sum of digits gives 979640.

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, 116 + ... + 1404.

2⁹⁷⁹⁶⁴⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 979640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1161000).

979640 is an abundant number, since it is smaller than the sum of its proper divisors (1342360).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

979640 is a wasteful number, since it uses less digits than its factorization.

979640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1319 (or 1315 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 979640 is about 989.7676495016. The cubic root of 979640 is about 99.3166746334.

The spelling of 979640 in words is "nine hundred seventy-nine thousand, six hundred forty".