990120172 has 12 divisors (see below), whose sum is σ = 1823905720. Its totient is φ = 469004256.

The previous prime is 990120163. The next prime is 990120181. The reversal of 990120172 is 271021099.

It is an interprime number because it is at equal distance from previous prime (990120163) and next prime (990120181).

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, 6513873 + ... + 6514024.

Almost surely, 2^990120172 is an apocalyptic number.

It is an amenable number.

990120172 is a deficient number, since it is larger than the sum of its proper divisors (833785548).

990120172 is a wasteful number, since it uses less digits than its factorization.

990120172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13027920 (or 13027918 counting only the distinct ones).

The product of its (nonzero) digits is 2268, while the sum is 31.

The square root of 990120172 is about 31466.1750455946. The cubic root of 990120172 is about 996.6958184086.

The spelling of 990120172 in words is "nine hundred ninety million, one hundred twenty thousand, one hundred seventy-two".