18243357 has 16 divisors (see below), whose sum is σ = 26902848. Its totient is φ = 10903680.

The previous prime is 18243353. The next prime is 18243361. The reversal of 18243357 is 75334281.

It is an interprime number because it is at equal distance from previous prime (18243353) and next prime (18243361).

It is not a de Polignac number, because 18243357 - 2² = 18243353 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18243353) 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, 1378 + ... + 6195.

It is an arithmetic number, because the mean of its divisors is an integer number (1681428).

Almost surely, 2^18243357 is an apocalyptic number.

It is an amenable number.

18243357 is a deficient number, since it is larger than the sum of its proper divisors (8659491).

18243357 is a wasteful number, since it uses less digits than its factorization.

18243357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7660.

The product of its digits is 20160, while the sum is 33.

The square root of 18243357 is about 4271.2242975522. The cubic root of 18243357 is about 263.2499226647.

The spelling of 18243357 in words is "eighteen million, two hundred forty-three thousand, three hundred fifty-seven".