9979321905 has 40 divisors (see below), whose sum is σ = 20444415552. Its totient is φ = 4561974432.

The previous prime is 9979321897. The next prime is 9979321939. The reversal of 9979321905 is 5091239799.

It is not a de Polignac number, because 9979321905 - 2³ = 9979321897 is a prime.

It is a super-2 number, since 2×9979321905² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1757187 + ... + 1762856.

Almost surely, 2^9979321905 is an apocalyptic number.

It is an amenable number.

9979321905 is an abundant number, since it is smaller than the sum of its proper divisors (10465093647).

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

9979321905 is a wasteful number, since it uses less digits than its factorization.

9979321905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3520067 (or 3520058 counting only the distinct ones).

The product of its (nonzero) digits is 1377810, while the sum is 54.

The square root of 9979321905 is about 99896.5560217168. The cubic root of 9979321905 is about 2152.9486784581.

The spelling of 9979321905 in words is "nine billion, nine hundred seventy-nine million, three hundred twenty-one thousand, nine hundred five".