120990945 has 32 divisors (see below), whose sum is σ = 198190080. Its totient is φ = 63011520.

The previous prime is 120990937. The next prime is 120990973. The reversal of 120990945 is 549099021.

It is not a de Polignac number, because 120990945 - 2³ = 120990937 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 131196 + ... + 132114.

It is an arithmetic number, because the mean of its divisors is an integer number (6193440).

Almost surely, 2^120990945 is an apocalyptic number.

120990945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

120990945 is a deficient number, since it is larger than the sum of its proper divisors (77199135).

120990945 is a wasteful number, since it uses less digits than its factorization.

120990945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1125.

The product of its (nonzero) digits is 29160, while the sum is 39.

The square root of 120990945 is about 10999.5884013903. The cubic root of 120990945 is about 494.5964060497.

The spelling of 120990945 in words is "one hundred twenty million, nine hundred ninety thousand, nine hundred forty-five".