12157642 has 32 divisors (see below), whose sum is σ = 21795840. Its totient is φ = 4976640.

The previous prime is 12157637. The next prime is 12157657. The reversal of 12157642 is 24675121.

It is a self number, because there is not a number n which added to its sum of digits gives 12157642.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47178 + ... + 47434.

It is an arithmetic number, because the mean of its divisors is an integer number (681120).

Almost surely, 2^12157642 is an apocalyptic number.

12157642 is a deficient number, since it is larger than the sum of its proper divisors (9638198).

12157642 is a wasteful number, since it uses less digits than its factorization.

12157642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406.

The product of its digits is 3360, while the sum is 28.

The square root of 12157642 is about 3486.7810370025. The cubic root of 12157642 is about 229.9410182722.

The spelling of 12157642 in words is "twelve million, one hundred fifty-seven thousand, six hundred forty-two".