990155924 has 24 divisors (see below), whose sum is σ = 1761626496. Its totient is φ = 486900000.

The previous prime is 990155917. The next prime is 990155953. The reversal of 990155924 is 429551099.

990155924 = 232² + 233² + ... + 1439².

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52889 + ... + 69119.

It is an arithmetic number, because the mean of its divisors is an integer number (73401104).

Almost surely, 2^990155924 is an apocalyptic number.

It is an amenable number.

990155924 is a deficient number, since it is larger than the sum of its proper divisors (771470572).

990155924 is a wasteful number, since it uses less digits than its factorization.

990155924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16487 (or 16485 counting only the distinct ones).

The product of its (nonzero) digits is 145800, while the sum is 44.

The square root of 990155924 is about 31466.7431425624. The cubic root of 990155924 is about 996.7078147437.

The spelling of 990155924 in words is "nine hundred ninety million, one hundred fifty-five thousand, nine hundred twenty-four".