12399156 has 180 divisors, whose sum is σ = 41713056. Its totient is φ = 3175200.

The previous prime is 12399143. The next prime is 12399157. The reversal of 12399156 is 65199321.

12399156 is nontrivially palindromic in base 5.

12399156 is digitally balanced in base 2 and base 8, 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 (36).

12399156 is strictly pandigital in base 8.

It is a self number, because there is not a number n which added to its sum of digits gives 12399156.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12399157) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 174601 + ... + 174671.

Almost surely, 2^12399156 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12399156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20856528).

12399156 is an abundant number, since it is smaller than the sum of its proper divisors (29313900).

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

12399156 is a wasteful number, since it uses less digits than its factorization.

12399156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112 (or 94 counting only the distinct ones).

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

The square root of 12399156 is about 3521.2435303455. The cubic root of 12399156 is about 231.4536539540.

It can be divided in two parts, 123991 and 56, that multiplied together give a palindrome (6943496).

The spelling of 12399156 in words is "twelve million, three hundred ninety-nine thousand, one hundred fifty-six".