18287157 has 32 divisors (see below), whose sum is σ = 28794880. Its totient is φ = 10108800.

The previous prime is 18287153. The next prime is 18287167. The reversal of 18287157 is 75178281.

It is not a de Polignac number, because 18287157 - 2² = 18287153 is a prime.

It is a super-2 number, since 2×18287157² = 668840222285298, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18287153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 121032 + ... + 121182.

It is an arithmetic number, because the mean of its divisors is an integer number (899840).

Almost surely, 2^18287157 is an apocalyptic number.

It is an amenable number.

18287157 is a deficient number, since it is larger than the sum of its proper divisors (10507723).

18287157 is a wasteful number, since it uses less digits than its factorization.

18287157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313.

The product of its digits is 31360, while the sum is 39.

The square root of 18287157 is about 4276.3485592267. The cubic root of 18287157 is about 263.4604309110.

The spelling of 18287157 in words is "eighteen million, two hundred eighty-seven thousand, one hundred fifty-seven".