12156399 has 20 divisors (see below), whose sum is σ = 18268096. Its totient is φ = 8055936.

The previous prime is 12156383. The next prime is 12156439. The reversal of 12156399 is 99365121.

12156399 is a `hidden beast` number, since 1 + 2 + 1 + 563 + 99 = 666.

It is not a de Polignac number, because 12156399 - 2⁴ = 12156383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12156329) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 17727 + ... + 18399.

Almost surely, 2^12156399 is an apocalyptic number.

12156399 is a deficient number, since it is larger than the sum of its proper divisors (6111697).

12156399 is an equidigital number, since it uses as much as digits as its factorization.

12156399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 908 (or 899 counting only the distinct ones).

The product of its digits is 14580, while the sum is 36.

The square root of 12156399 is about 3486.6027878151. The cubic root of 12156399 is about 229.9331815983.

The spelling of 12156399 in words is "twelve million, one hundred fifty-six thousand, three hundred ninety-nine".