18288157 has 4 divisors (see below), whose sum is σ = 18303516. Its totient is φ = 18272800.

The previous prime is 18288143. The next prime is 18288191. The reversal of 18288157 is 75188281.

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 217156 + 18071001 = 466^2 + 4251^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18288157 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 (18288857) 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, 5728 + ... + 8329.

It is an arithmetic number, because the mean of its divisors is an integer number (4575879).

Almost surely, 2^18288157 is an apocalyptic number.

It is an amenable number.

18288157 is a deficient number, since it is larger than the sum of its proper divisors (15359).

18288157 is a wasteful number, since it uses less digits than its factorization.

18288157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15358.

The product of its digits is 35840, while the sum is 40.

The square root of 18288157 is about 4276.4654798092. The cubic root of 18288157 is about 263.4652331087.

The spelling of 18288157 in words is "eighteen million, two hundred eighty-eight thousand, one hundred fifty-seven".