18157087 has 8 divisors (see below), whose sum is σ = 19970496. Its totient is φ = 16403232.

The previous prime is 18157081. The next prime is 18157099. The reversal of 18157087 is 78075181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18157087 - 2³ = 18157079 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18157081) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14248 + ... + 15469.

It is an arithmetic number, because the mean of its divisors is an integer number (2496312).

Almost surely, 2^18157087 is an apocalyptic number.

18157087 is a deficient number, since it is larger than the sum of its proper divisors (1813409).

18157087 is a wasteful number, since it uses less digits than its factorization.

18157087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29777.

The product of its (nonzero) digits is 15680, while the sum is 37.

The square root of 18157087 is about 4261.1133521651. The cubic root of 18157087 is about 262.8343108629.

The spelling of 18157087 in words is "eighteen million, one hundred fifty-seven thousand, eighty-seven".