120990990 has 32 divisors (see below), whose sum is σ = 291424896. Its totient is φ = 32148000.

The previous prime is 120990979. The next prime is 120991007. The reversal of 120990990 is 99099021.

It is a happy number.

It is a super-2 number, since 2×120990990² = 29277639322360200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1365 + ... + 15615.

It is an arithmetic number, because the mean of its divisors is an integer number (9107028).

Almost surely, 2^120990990 is an apocalyptic number.

120990990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

120990990 is an abundant number, since it is smaller than the sum of its proper divisors (170433906).

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

120990990 is a wasteful number, since it uses less digits than its factorization.

120990990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14544.

The product of its (nonzero) digits is 13122, while the sum is 39.

The square root of 120990990 is about 10999.5904469212. The cubic root of 120990990 is about 494.5964673678.

The spelling of 120990990 in words is "one hundred twenty million, nine hundred ninety thousand, nine hundred ninety".