13918257 has 16 divisors (see below), whose sum is σ = 21833280. Its totient is φ = 8732736.

The previous prime is 13918249. The next prime is 13918273. The reversal of 13918257 is 75281931.

It is not a de Polignac number, because 13918257 - 2³ = 13918249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13918217) 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, 14703 + ... + 15620.

It is an arithmetic number, because the mean of its divisors is an integer number (1364580).

Almost surely, 2^13918257 is an apocalyptic number.

13918257 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

13918257 is a deficient number, since it is larger than the sum of its proper divisors (7915023).

13918257 is a wasteful number, since it uses less digits than its factorization.

13918257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30349 (or 30343 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 13918257 is about 3730.7180274044. The cubic root of 13918257 is about 240.5442336909.

The spelling of 13918257 in words is "thirteen million, nine hundred eighteen thousand, two hundred fifty-seven".