120556865 has 32 divisors (see below), whose sum is σ = 171714816. Its totient is φ = 80098560.

The previous prime is 120556847. The next prime is 120556889. The reversal of 120556865 is 568655021.

It is not a de Polignac number, because 120556865 - 2¹⁸ = 120294721 is a prime.

It is a Curzon number.

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, 72827 + ... + 74463.

It is an arithmetic number, because the mean of its divisors is an integer number (5366088).

Almost surely, 2^120556865 is an apocalyptic number.

It is an amenable number.

120556865 is a deficient number, since it is larger than the sum of its proper divisors (51157951).

120556865 is a wasteful number, since it uses less digits than its factorization.

120556865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1769.

The product of its (nonzero) digits is 72000, while the sum is 38.

The square root of 120556865 is about 10979.8390243209. The cubic root of 120556865 is about 494.0042083596.

The spelling of 120556865 in words is "one hundred twenty million, five hundred fifty-six thousand, eight hundred sixty-five".