18157857 has 16 divisors (see below), whose sum is σ = 25280640. Its totient is φ = 11578112.

The previous prime is 18157837. The next prime is 18157859. The reversal of 18157857 is 75875181.

It is a cyclic number.

It is not a de Polignac number, because 18157857 - 2¹⁵ = 18125089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18157859) 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, 8908 + ... + 10754.

It is an arithmetic number, because the mean of its divisors is an integer number (1580040).

Almost surely, 2^18157857 is an apocalyptic number.

It is an amenable number.

18157857 is a deficient number, since it is larger than the sum of its proper divisors (7122783).

18157857 is a wasteful number, since it uses less digits than its factorization.

18157857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1992.

The product of its digits is 78400, while the sum is 42.

The square root of 18157857 is about 4261.2037031806. The cubic root of 18157857 is about 262.8380262084.

The spelling of 18157857 in words is "eighteen million, one hundred fifty-seven thousand, eight hundred fifty-seven".