13889731 has 8 divisors (see below), whose sum is σ = 15049584. Its totient is φ = 12768000.

The previous prime is 13889717. The next prime is 13889737. The reversal of 13889731 is 13798831.

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 13889731 - 2⁹ = 13889219 is a prime.

It is a super-2 number, since 2×13889731² = 385849254504722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13889737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8770 + ... + 10231.

It is an arithmetic number, because the mean of its divisors is an integer number (1881198).

Almost surely, 2^13889731 is an apocalyptic number.

13889731 is a deficient number, since it is larger than the sum of its proper divisors (1159853).

13889731 is a wasteful number, since it uses less digits than its factorization.

13889731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19061.

The product of its digits is 36288, while the sum is 40.

The square root of 13889731 is about 3726.8929418485. The cubic root of 13889731 is about 240.3797864239.

The spelling of 13889731 in words is "thirteen million, eight hundred eighty-nine thousand, seven hundred thirty-one".