13664739 has 8 divisors (see below), whose sum is σ = 19876032. Its totient is φ = 8281640.

The previous prime is 13664723. The next prime is 13664747. The reversal of 13664739 is 93746631.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13664739 - 2⁴ = 13664723 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13664697 and 13664706.

It is not an unprimeable number, because it can be changed into a prime (13664759) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 207009 + ... + 207074.

It is an arithmetic number, because the mean of its divisors is an integer number (2484504).

Almost surely, 2^13664739 is an apocalyptic number.

13664739 is a deficient number, since it is larger than the sum of its proper divisors (6211293).

13664739 is a wasteful number, since it uses less digits than its factorization.

13664739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414097.

The product of its digits is 81648, while the sum is 39.

The square root of 13664739 is about 3696.5847751675. The cubic root of 13664739 is about 239.0747885434.

It can be divided in two parts, 1366 and 4739, that added together give a triangular number (6105 = T₁₁₀).

The spelling of 13664739 in words is "thirteen million, six hundred sixty-four thousand, seven hundred thirty-nine".