978238920 has 32 divisors (see below), whose sum is σ = 2934717120. Its totient is φ = 260863680.

The previous prime is 978238879. The next prime is 978238931. The reversal of 978238920 is 29832879.

It is a happy number.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 978238920.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4075876 + ... + 4076115.

It is an arithmetic number, because the mean of its divisors is an integer number (91709910).

Almost surely, 2^978238920 is an apocalyptic number.

It is an amenable number.

978238920 is an abundant number, since it is smaller than the sum of its proper divisors (1956478200).

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

978238920 is a wasteful number, since it uses less digits than its factorization.

978238920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8152005 (or 8152001 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 48.

The square root of 978238920 is about 31276.8112185370. The cubic root of 978238920 is about 992.6930451204.

The spelling of 978238920 in words is "nine hundred seventy-eight million, two hundred thirty-eight thousand, nine hundred twenty".