120815955 has 48 divisors (see below), whose sum is σ = 233906400. Its totient is φ = 59470848.

The previous prime is 120815953. The next prime is 120815969. The reversal of 120815955 is 559518021.

It is a happy number.

It is not a de Polignac number, because 120815955 - 2¹ = 120815953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (120815953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11971 + ... + 19619.

It is an arithmetic number, because the mean of its divisors is an integer number (4873050).

Almost surely, 2^120815955 is an apocalyptic number.

120815955 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

120815955 is a deficient number, since it is larger than the sum of its proper divisors (113090445).

120815955 is an equidigital number, since it uses as much as digits as its factorization.

120815955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7682 (or 7670 counting only the distinct ones).

The product of its (nonzero) digits is 18000, while the sum is 36.

The square root of 120815955 is about 10991.6311346406. The cubic root of 120815955 is about 494.3578449895.

The spelling of 120815955 in words is "one hundred twenty million, eight hundred fifteen thousand, nine hundred fifty-five".