13391744 has 16 divisors (see below), whose sum is σ = 26679120. Its totient is φ = 6695808.

The previous prime is 13391731. The next prime is 13391747. The reversal of 13391744 is 44719331.

It is a tau number, because it is divible by the number of its divisors (16).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a self number, because there is not a number n which added to its sum of digits gives 13391744.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13391747) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52184 + ... + 52439.

It is an arithmetic number, because the mean of its divisors is an integer number (1667445).

Almost surely, 2^13391744 is an apocalyptic number.

It is an amenable number.

13391744 is a deficient number, since it is larger than the sum of its proper divisors (13287376).

13391744 is an equidigital number, since it uses as much as digits as its factorization.

13391744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104637 (or 104625 counting only the distinct ones).

The product of its digits is 9072, while the sum is 32.

The square root of 13391744 is about 3659.4731861294. The cubic root of 13391744 is about 237.4719833988.

The spelling of 13391744 in words is "thirteen million, three hundred ninety-one thousand, seven hundred forty-four".