13808431 has 16 divisors (see below), whose sum is σ = 17414208. Its totient is φ = 10656000.

The previous prime is 13808401. The next prime is 13808449. The reversal of 13808431 is 13480831.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13808431 is a prime.

It is a super-2 number, since 2×13808431² = 381345533363522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 13808431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13808401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1881 + ... + 5581.

It is an arithmetic number, because the mean of its divisors is an integer number (1088388).

Almost surely, 2^13808431 is an apocalyptic number.

13808431 is a deficient number, since it is larger than the sum of its proper divisors (3605777).

13808431 is a wasteful number, since it uses less digits than its factorization.

13808431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3762.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 13808431 is about 3715.9697253880. The cubic root of 13808431 is about 239.9098677754.

The spelling of 13808431 in words is "thirteen million, eight hundred eight thousand, four hundred thirty-one".