13039749 has 12 divisors (see below), whose sum is σ = 19191276. Its totient is φ = 8528832.

The previous prime is 13039721. The next prime is 13039751. The reversal of 13039749 is 94793031.

13039749 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 11009124 + 2030625 = 3318^2 + 1425^2 .

It is a de Polignac number, because none of the positive numbers 2^k-13039749 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13039709) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13192 + ... + 14145.

It is an arithmetic number, because the mean of its divisors is an integer number (1599273).

Almost surely, 2^13039749 is an apocalyptic number.

It is an amenable number.

13039749 is a deficient number, since it is larger than the sum of its proper divisors (6151527).

13039749 is a wasteful number, since it uses less digits than its factorization.

13039749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27396 (or 27393 counting only the distinct ones).

The product of its (nonzero) digits is 20412, while the sum is 36.

The square root of 13039749 is about 3611.0592628756. The cubic root of 13039749 is about 235.3728741716.

The spelling of 13039749 in words is "thirteen million, thirty-nine thousand, seven hundred forty-nine".