989665972 has 12 divisors (see below), whose sum is σ = 1739683456. Its totient is φ = 492613560.

The previous prime is 989665969. The next prime is 989665991. The reversal of 989665972 is 279566989.

It is a super-2 number, since 2×989665972² = 1958877472269409568, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 989665972.

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, 553854 + ... + 555637.

Almost surely, 2^989665972 is an apocalyptic number.

It is an amenable number.

989665972 is a deficient number, since it is larger than the sum of its proper divisors (750017484).

989665972 is a wasteful number, since it uses less digits than its factorization.

989665972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1109718 (or 1109716 counting only the distinct ones).

The product of its digits is 14696640, while the sum is 61.

The square root of 989665972 is about 31458.9569439293. The cubic root of 989665972 is about 996.5433896113.

The spelling of 989665972 in words is "nine hundred eighty-nine million, six hundred sixty-five thousand, nine hundred seventy-two".