9879621972 has 24 divisors (see below), whose sum is σ = 25148128992. Its totient is φ = 2993824800.

The previous prime is 9879621967. The next prime is 9879621977. The reversal of 9879621972 is 2791269789.

It is an interprime number because it is at equal distance from previous prime (9879621967) and next prime (9879621977).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9879621977) 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, 37422679 + ... + 37422942.

It is an arithmetic number, because the mean of its divisors is an integer number (1047838708).

Almost surely, 2^9879621972 is an apocalyptic number.

It is an amenable number.

9879621972 is an abundant number, since it is smaller than the sum of its proper divisors (15268507020).

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

9879621972 is a wasteful number, since it uses less digits than its factorization.

9879621972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74845639 (or 74845637 counting only the distinct ones).

The product of its digits is 6858432, while the sum is 60.

The square root of 9879621972 is about 99396.2875161844. The cubic root of 9879621972 is about 2145.7548810403.

The spelling of 9879621972 in words is "nine billion, eight hundred seventy-nine million, six hundred twenty-one thousand, nine hundred seventy-two".