13917231 has 32 divisors (see below), whose sum is σ = 21880320. Its totient is φ = 8724672.

The previous prime is 13917223. The next prime is 13917247. The reversal of 13917231 is 13271931.

It is not a de Polignac number, because 13917231 - 2³ = 13917223 is a prime.

It is a super-2 number, since 2×13917231² = 387378637414722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 13917195 and 13917204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13912231) 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 31 ways as a sum of consecutive naturals, for example, 45180 + ... + 45486.

It is an arithmetic number, because the mean of its divisors is an integer number (683760).

Almost surely, 2^13917231 is an apocalyptic number.

13917231 is a deficient number, since it is larger than the sum of its proper divisors (7963089).

13917231 is a wasteful number, since it uses less digits than its factorization.

13917231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412 (or 406 counting only the distinct ones).

The product of its digits is 1134, while the sum is 27.

The square root of 13917231 is about 3730.5805178283. The cubic root of 13917231 is about 240.5383228825.

The spelling of 13917231 in words is "thirteen million, nine hundred seventeen thousand, two hundred thirty-one".