12156512 has 48 divisors (see below), whose sum is σ = 25401600. Its totient is φ = 5715072.

The previous prime is 12156511. The next prime is 12156527. The reversal of 12156512 is 21565121.

It is a happy number.

It is a super-2 number, since 2×12156512² = 295561568012288, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12156511) 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 7 ways as a sum of consecutive naturals, for example, 60989 + ... + 61187.

It is an arithmetic number, because the mean of its divisors is an integer number (529200).

Almost surely, 2^12156512 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12156512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12700800).

12156512 is an abundant number, since it is smaller than the sum of its proper divisors (13245088).

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

12156512 is a wasteful number, since it uses less digits than its factorization.

12156512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315 (or 307 counting only the distinct ones).

The product of its digits is 600, while the sum is 23.

The square root of 12156512 is about 3486.6189926632. The cubic root of 12156512 is about 229.9338940453.

The spelling of 12156512 in words is "twelve million, one hundred fifty-six thousand, five hundred twelve".