979840 has 32 divisors (see below), whose sum is σ = 2343960. Its totient is φ = 391680.

The previous prime is 979831. The next prime is 979873. The reversal of 979840 is 48979.

It is a happy number.

979840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (32).

It is a self number, because there is not a number n which added to its sum of digits gives 979840.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 126 + ... + 1405.

2⁹⁷⁹⁸⁴⁰ 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 979840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1171980).

979840 is an abundant number, since it is smaller than the sum of its proper divisors (1364120).

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

979840 is a wasteful number, since it uses less digits than its factorization.

979840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1550 (or 1538 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 979840 is about 989.8686781589. The cubic root of 979840 is about 99.3234328926.

The spelling of 979840 in words is "nine hundred seventy-nine thousand, eight hundred forty".