9987972 has 12 divisors (see below), whose sum is σ = 23305296. Its totient is φ = 3329320.

The previous prime is 9987961. The next prime is 9987973. The reversal of 9987972 is 2797899.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (9987973) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 416154 + ... + 416177.

It is an arithmetic number, because the mean of its divisors is an integer number (1942108).

Almost surely, 2^9987972 is an apocalyptic number.

It is an amenable number.

9987972 is an abundant number, since it is smaller than the sum of its proper divisors (13317324).

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

9987972 is a wasteful number, since it uses less digits than its factorization.

9987972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 832338 (or 832336 counting only the distinct ones).

The product of its digits is 571536, while the sum is 51.

The square root of 9987972 is about 3160.3752941700. The cubic root of 9987972 is about 215.3570558798.

The spelling of 9987972 in words is "nine million, nine hundred eighty-seven thousand, nine hundred seventy-two".