13129956 has 36 divisors (see below), whose sum is σ = 37931712. Its totient is φ = 3751344.

The previous prime is 13129951. The next prime is 13129979. The reversal of 13129956 is 65992131.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 13129956.

It is not an unprimeable number, because it can be changed into a prime (13129951) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25800 + ... + 26303.

Almost surely, 2^13129956 is an apocalyptic number.

It is an amenable number.

13129956 is an abundant number, since it is smaller than the sum of its proper divisors (24801756).

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

13129956 is a wasteful number, since it uses less digits than its factorization.

13129956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52120 (or 52115 counting only the distinct ones).

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

The square root of 13129956 is about 3623.5281149730. The cubic root of 13129956 is about 235.9143853004.

The spelling of 13129956 in words is "thirteen million, one hundred twenty-nine thousand, nine hundred fifty-six".