13907731 has 4 divisors (see below), whose sum is σ = 13919752. Its totient is φ = 13895712.

The previous prime is 13907689. The next prime is 13907737. The reversal of 13907731 is 13770931.

13907731 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13770931 = 1597 ⋅8623.

It is a cyclic number.

It is not a de Polignac number, because 13907731 - 2⁷ = 13907603 is a prime.

It is a super-2 number, since 2×13907731² = 386849963136722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13907693 and 13907702.

It is not an unprimeable number, because it can be changed into a prime (13907737) 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, 4065 + ... + 6658.

It is an arithmetic number, because the mean of its divisors is an integer number (3479938).

Almost surely, 2^13907731 is an apocalyptic number.

13907731 is a deficient number, since it is larger than the sum of its proper divisors (12021).

13907731 is a wasteful number, since it uses less digits than its factorization.

13907731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12020.

The product of its (nonzero) digits is 3969, while the sum is 31.

The square root of 13907731 is about 3729.3070401886. The cubic root of 13907731 is about 240.4835793728.

The spelling of 13907731 in words is "thirteen million, nine hundred seven thousand, seven hundred thirty-one".