18363157 has 4 divisors (see below), whose sum is σ = 18377836. Its totient is φ = 18348480.

The previous prime is 18363143. The next prime is 18363173. The reversal of 18363157 is 75136381.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2792241 + 15570916 = 1671^2 + 3946^2 .

It is a cyclic number.

It is not a de Polignac number, because 18363157 - 2⁷ = 18363029 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18363127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5268 + ... + 8029.

It is an arithmetic number, because the mean of its divisors is an integer number (4594459).

Almost surely, 2^18363157 is an apocalyptic number.

It is an amenable number.

18363157 is a deficient number, since it is larger than the sum of its proper divisors (14679).

18363157 is a wasteful number, since it uses less digits than its factorization.

18363157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14678.

The product of its digits is 15120, while the sum is 34.

The square root of 18363157 is about 4285.2254316430. The cubic root of 18363157 is about 263.8249001506.

The spelling of 18363157 in words is "eighteen million, three hundred sixty-three thousand, one hundred fifty-seven".