978844840 has 32 divisors (see below), whose sum is σ = 2273448960. Its totient is φ = 378907200.

The previous prime is 978844817. The next prime is 978844843. The reversal of 978844840 is 48448879.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (978844843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 393456 + ... + 395935.

It is an arithmetic number, because the mean of its divisors is an integer number (71045280).

Almost surely, 2^978844840 is an apocalyptic number.

It is an amenable number.

978844840 is an abundant number, since it is smaller than the sum of its proper divisors (1294604120).

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

978844840 is a wasteful number, since it uses less digits than its factorization.

978844840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 789433 (or 789429 counting only the distinct ones).

The product of its (nonzero) digits is 2064384, while the sum is 52.

The square root of 978844840 is about 31286.4961285216. The cubic root of 978844840 is about 992.8979604406.

The spelling of 978844840 in words is "nine hundred seventy-eight million, eight hundred forty-four thousand, eight hundred forty".