18856157 has 2 divisors, whose sum is σ = 18856158. Its totient is φ = 18856156.

The previous prime is 18856147. The next prime is 18856183. The reversal of 18856157 is 75165881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18757561 + 98596 = 4331^2 + 314^2 .

It is a cyclic number.

It is not a de Polignac number, because 18856157 - 2⁴ = 18856141 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18856147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9428078 + 9428079.

It is an arithmetic number, because the mean of its divisors is an integer number (9428079).

Almost surely, 2^18856157 is an apocalyptic number.

It is an amenable number.

18856157 is a deficient number, since it is larger than the sum of its proper divisors (1).

18856157 is an equidigital number, since it uses as much as digits as its factorization.

18856157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 67200, while the sum is 41.

The square root of 18856157 is about 4342.3676721346. The cubic root of 18856157 is about 266.1650708128.

The spelling of 18856157 in words is "eighteen million, eight hundred fifty-six thousand, one hundred fifty-seven".