13128732 has 18 divisors (see below), whose sum is σ = 33186608. Its totient is φ = 4376232.

The previous prime is 13128727. The next prime is 13128737. The reversal of 13128732 is 23782131.

It is an interprime number because it is at equal distance from previous prime (13128727) and next prime (13128737).

It is a tau number, because it is divible by the number of its divisors (18).

It is a junction number, because it is equal to n+sod(n) for n = 13128696 and 13128705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13128737) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 182308 + ... + 182379.

Almost surely, 2^13128732 is an apocalyptic number.

13128732 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

13128732 is an abundant number, since it is smaller than the sum of its proper divisors (20057876).

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

13128732 is a wasteful number, since it uses less digits than its factorization.

13128732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364697 (or 364692 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 13128732 is about 3623.3592148723. The cubic root of 13128732 is about 235.9070542735.

The spelling of 13128732 in words is "thirteen million, one hundred twenty-eight thousand, seven hundred thirty-two".