978910972 has 12 divisors (see below), whose sum is σ = 1844870776. Its totient is φ = 451805040.

The previous prime is 978910939. The next prime is 978910991. The reversal of 978910972 is 279019879.

It is a super-3 number, since 3×978910972³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (52), and also a Moran number because the ratio is a prime number: 18825211 = 978910972 / (9 + 7 + 8 + 9 + 1 + 0 + 9 + 7 + 2).

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, 9412554 + ... + 9412657.

Almost surely, 2^978910972 is an apocalyptic number.

It is an amenable number.

978910972 is a deficient number, since it is larger than the sum of its proper divisors (865959804).

978910972 is a wasteful number, since it uses less digits than its factorization.

978910972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18825228 (or 18825226 counting only the distinct ones).

The product of its (nonzero) digits is 571536, while the sum is 52.

The square root of 978910972 is about 31287.5529883690. The cubic root of 978910972 is about 992.9203204193.

The spelling of 978910972 in words is "nine hundred seventy-eight million, nine hundred ten thousand, nine hundred seventy-two".