18318357 has 6 divisors (see below), whose sum is σ = 26459862. Its totient is φ = 12212232.

The previous prime is 18318347. The next prime is 18318359. The reversal of 18318357 is 75381381.

It can be written as a sum of positive squares in only one way, i.e., 18096516 + 221841 = 4254^2 + 471^2 .

It is not a de Polignac number, because 18318357 - 2⁴ = 18318341 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18318359) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1017678 + ... + 1017695.

It is an arithmetic number, because the mean of its divisors is an integer number (4409977).

Almost surely, 2^18318357 is an apocalyptic number.

It is an amenable number.

18318357 is a deficient number, since it is larger than the sum of its proper divisors (8141505).

18318357 is a wasteful number, since it uses less digits than its factorization.

18318357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2035379 (or 2035376 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 18318357 is about 4279.9949766326. The cubic root of 18318357 is about 263.6101770805.

The spelling of 18318357 in words is "eighteen million, three hundred eighteen thousand, three hundred fifty-seven".