18133357 has 16 divisors (see below), whose sum is σ = 20934144. Its totient is φ = 15552000.

The previous prime is 18133337. The next prime is 18133363. The reversal of 18133357 is 75333181.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18133357 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18133337) 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, 13333 + ... + 14629.

It is an arithmetic number, because the mean of its divisors is an integer number (1308384).

Almost surely, 2^18133357 is an apocalyptic number.

It is an amenable number.

18133357 is a deficient number, since it is larger than the sum of its proper divisors (2800787).

18133357 is a wasteful number, since it uses less digits than its factorization.

18133357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1380.

The product of its digits is 7560, while the sum is 31.

The square root of 18133357 is about 4258.3279582484. The cubic root of 18133357 is about 262.7197591307.

The spelling of 18133357 in words is "eighteen million, one hundred thirty-three thousand, three hundred fifty-seven".