12156642 has 20 divisors (see below), whose sum is σ = 27240246. Its totient is φ = 4052160.

The previous prime is 12156631. The next prime is 12156643. The reversal of 12156642 is 24665121.

12156642 is a `hidden beast` number, since 1 + 2 + 15 + 6 + 642 = 666.

It can be written as a sum of positive squares in only one way, i.e., 7834401 + 4322241 = 2799^2 + 2079^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (12156643) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 37359 + ... + 37682.

Almost surely, 2^12156642 is an apocalyptic number.

12156642 is an abundant number, since it is smaller than the sum of its proper divisors (15083604).

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

12156642 is an equidigital number, since it uses as much as digits as its factorization.

12156642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75055 (or 75046 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 12156642 is about 3486.6376353157. The cubic root of 12156642 is about 229.9347136691.

The spelling of 12156642 in words is "twelve million, one hundred fifty-six thousand, six hundred forty-two".