13856731 has 8 divisors (see below), whose sum is σ = 15872000. Its totient is φ = 11850408.

The previous prime is 13856723. The next prime is 13856737. The reversal of 13856731 is 13765831.

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 13856731 - 2³ = 13856723 is a prime.

It is a super-2 number, since 2×13856731² = 384017988012722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13856737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1510 + ... + 5476.

It is an arithmetic number, because the mean of its divisors is an integer number (1984000).

Almost surely, 2^13856731 is an apocalyptic number.

13856731 is a deficient number, since it is larger than the sum of its proper divisors (2015269).

13856731 is an equidigital number, since it uses as much as digits as its factorization.

13856731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4473.

The product of its digits is 15120, while the sum is 34.

The square root of 13856731 is about 3722.4630286948. The cubic root of 13856731 is about 240.1892662129.

The spelling of 13856731 in words is "thirteen million, eight hundred fifty-six thousand, seven hundred thirty-one".