12155556 has 24 divisors (see below), whose sum is σ = 32415040. Its totient is φ = 3472992.

The previous prime is 12155537. The next prime is 12155567. The reversal of 12155556 is 65555121.

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, 72271 + ... + 72438.

Almost surely, 2^12155556 is an apocalyptic number.

It is an amenable number.

12155556 is an abundant number, since it is smaller than the sum of its proper divisors (20259484).

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

12155556 is a wasteful number, since it uses less digits than its factorization.

12155556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144723 (or 144721 counting only the distinct ones).

The product of its digits is 7500, while the sum is 30.

The square root of 12155556 is about 3486.4818944030. The cubic root of 12155556 is about 229.9278664785.

It can be divided in two parts, 121 and 55556, that multiplied together give a palindrome (6722276).

The spelling of 12155556 in words is "twelve million, one hundred fifty-five thousand, five hundred fifty-six".