13047391 has 4 divisors (see below), whose sum is σ = 14911312. Its totient is φ = 11183472.

The previous prime is 13047367. The next prime is 13047407. The reversal of 13047391 is 19374031.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13047391 - 2⁷ = 13047263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13047691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 931950 + ... + 931963.

It is an arithmetic number, because the mean of its divisors is an integer number (3727828).

Almost surely, 2^13047391 is an apocalyptic number.

13047391 is a deficient number, since it is larger than the sum of its proper divisors (1863921).

13047391 is an equidigital number, since it uses as much as digits as its factorization.

13047391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1863920.

The product of its (nonzero) digits is 2268, while the sum is 28.

The square root of 13047391 is about 3612.1172461591. The cubic root of 13047391 is about 235.4188456147.

The spelling of 13047391 in words is "thirteen million, forty-seven thousand, three hundred ninety-one".