12391272 has 32 divisors (see below), whose sum is σ = 34420800. Its totient is φ = 4130352.

The previous prime is 12391261. The next prime is 12391297. The reversal of 12391272 is 27219321.

12391272 is a `hidden beast` number, since 1 + 2 + 391 + 272 = 666.

12391272 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 a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28468 + ... + 28899.

It is an arithmetic number, because the mean of its divisors is an integer number (1075650).

Almost surely, 2^12391272 is an apocalyptic number.

12391272 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12391272 is an abundant number, since it is smaller than the sum of its proper divisors (22029528).

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

12391272 is a wasteful number, since it uses less digits than its factorization.

12391272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57382 (or 57372 counting only the distinct ones).

The product of its digits is 1512, while the sum is 27.

The square root of 12391272 is about 3520.1238614572. The cubic root of 12391272 is about 231.4045869716.

The spelling of 12391272 in words is "twelve million, three hundred ninety-one thousand, two hundred seventy-two".