12555920 has 40 divisors (see below), whose sum is σ = 31440696. Its totient is φ = 4635648.

The previous prime is 12555863. The next prime is 12555931. The reversal of 12555920 is 2955521.

It can be written as a sum of positive squares in 4 ways, for example, as 473344 + 12082576 = 688^2 + 3476^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×12555920² = 315302254092800, which contains 22 as substring.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 4997 + ... + 7076.

Almost surely, 2^12555920 is an apocalyptic number.

12555920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12555920 is an abundant number, since it is smaller than the sum of its proper divisors (18884776).

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

12555920 is a wasteful number, since it uses less digits than its factorization.

12555920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12099 (or 12093 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 29.

The square root of 12555920 is about 3543.4333632792. The cubic root of 12555920 is about 232.4250037530.

The spelling of 12555920 in words is "twelve million, five hundred fifty-five thousand, nine hundred twenty".