13869731 has 2 divisors, whose sum is σ = 13869732. Its totient is φ = 13869730.

The previous prime is 13869727. The next prime is 13869749. The reversal of 13869731 is 13796831.

13869731 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13869731 - 2² = 13869727 is a prime.

It is a super-2 number, since 2×13869731² = 384738876024722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (13869721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6934865 + 6934866.

It is an arithmetic number, because the mean of its divisors is an integer number (6934866).

Almost surely, 2^13869731 is an apocalyptic number.

13869731 is a deficient number, since it is larger than the sum of its proper divisors (1).

13869731 is an equidigital number, since it uses as much as digits as its factorization.

13869731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 38.

The square root of 13869731 is about 3724.2087750286. The cubic root of 13869731 is about 240.2643557008.

Subtracting from 13869731 its reverse (13796831), we obtain a square (72900 = 270²).

The spelling of 13869731 in words is "thirteen million, eight hundred sixty-nine thousand, seven hundred thirty-one".