13129776 has 120 divisors (see below), whose sum is σ = 41705664. Its totient is φ = 3965760.

The previous prime is 13129769. The next prime is 13129793. The reversal of 13129776 is 67792131.

It is a happy number.

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 13129776.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42615 + ... + 42921.

Almost surely, 2^13129776 is an apocalyptic number.

13129776 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13129776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20852832).

13129776 is an abundant number, since it is smaller than the sum of its proper divisors (28575888).

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

13129776 is a wasteful number, since it uses less digits than its factorization.

13129776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341 (or 323 counting only the distinct ones).

The product of its digits is 15876, while the sum is 36.

The square root of 13129776 is about 3623.5032772167. The cubic root of 13129776 is about 235.9133072368.

The spelling of 13129776 in words is "thirteen million, one hundred twenty-nine thousand, seven hundred seventy-six".