13889691 has 8 divisors (see below), whose sum is σ = 20577360. Its totient is φ = 9259776.

The previous prime is 13889671. The next prime is 13889713. The reversal of 13889691 is 19698831.

It is not a de Polignac number, because 13889691 - 2⁹ = 13889179 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13889641) 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, 257190 + ... + 257243.

It is an arithmetic number, because the mean of its divisors is an integer number (2572170).

Almost surely, 2^13889691 is an apocalyptic number.

13889691 is a deficient number, since it is larger than the sum of its proper divisors (6687669).

13889691 is an equidigital number, since it uses as much as digits as its factorization.

13889691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 514442 (or 514436 counting only the distinct ones).

The product of its digits is 93312, while the sum is 45.

The square root of 13889691 is about 3726.8875754442. The cubic root of 13889691 is about 240.3795556731.

The spelling of 13889691 in words is "thirteen million, eight hundred eighty-nine thousand, six hundred ninety-one".