13129040 has 20 divisors (see below), whose sum is σ = 30525204. Its totient is φ = 5251584.

The previous prime is 13128991. The next prime is 13129063. The reversal of 13129040 is 4092131.

It can be written as a sum of positive squares in 2 ways, for example, as 6431296 + 6697744 = 2536^2 + 2588^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a nialpdrome in base 16.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81977 + ... + 82136.

Almost surely, 2^13129040 is an apocalyptic number.

13129040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13129040 is an abundant number, since it is smaller than the sum of its proper divisors (17396164).

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

13129040 is a wasteful number, since it uses less digits than its factorization.

13129040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164126 (or 164120 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 13129040 is about 3623.4017166193. The cubic root of 13129040 is about 235.9088990520.

The spelling of 13129040 in words is "thirteen million, one hundred twenty-nine thousand, forty".