12139956 has 60 divisors (see below), whose sum is σ = 32169060. Its totient is φ = 3991680.

The previous prime is 12139943. The next prime is 12139961. The reversal of 12139956 is 65993121.

It can be written as a sum of positive squares in 2 ways, for example, as 810000 + 11329956 = 900^2 + 3366^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 12139956.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 28626 + ... + 29046.

It is an arithmetic number, because the mean of its divisors is an integer number (536151).

Almost surely, 2^12139956 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 12139956, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16084530).

12139956 is an abundant number, since it is smaller than the sum of its proper divisors (20029104).

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

12139956 is a wasteful number, since it uses less digits than its factorization.

12139956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 526 (or 515 counting only the distinct ones).

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

The square root of 12139956 is about 3484.2439639038. The cubic root of 12139956 is about 229.8294640077.

The spelling of 12139956 in words is "twelve million, one hundred thirty-nine thousand, nine hundred fifty-six".