12391656 has 16 divisors (see below), whose sum is σ = 30979200. Its totient is φ = 4130544.

The previous prime is 12391649. The next prime is 12391663. The reversal of 12391656 is 65619321.

It is a happy number.

12391656 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (12391649) and next prime (12391663).

It is a super-3 number, since 3×12391656³ (a number of 22 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 258136 + ... + 258183.

It is an arithmetic number, because the mean of its divisors is an integer number (1936200).

Almost surely, 2^12391656 is an apocalyptic number.

It is an amenable number.

12391656 is an abundant number, since it is smaller than the sum of its proper divisors (18587544).

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

12391656 is a wasteful number, since it uses less digits than its factorization.

12391656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 516328 (or 516324 counting only the distinct ones).

The product of its digits is 9720, while the sum is 33.

The square root of 12391656 is about 3520.1784045699. The cubic root of 12391656 is about 231.4069773219.

The spelling of 12391656 in words is "twelve million, three hundred ninety-one thousand, six hundred fifty-six".