18456157 has 2 divisors, whose sum is σ = 18456158. Its totient is φ = 18456156.

The previous prime is 18456121. The next prime is 18456161. The reversal of 18456157 is 75165481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16112196 + 2343961 = 4014^2 + 1531^2 .

It is a cyclic number.

It is not a de Polignac number, because 18456157 - 2¹⁹ = 17931869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18456107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9228078 + 9228079.

It is an arithmetic number, because the mean of its divisors is an integer number (9228079).

Almost surely, 2^18456157 is an apocalyptic number.

It is an amenable number.

18456157 is a deficient number, since it is larger than the sum of its proper divisors (1).

18456157 is an equidigital number, since it uses as much as digits as its factorization.

18456157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 33600, while the sum is 37.

The square root of 18456157 is about 4296.0629650879. The cubic root of 18456157 is about 264.2695297891.

The spelling of 18456157 in words is "eighteen million, four hundred fifty-six thousand, one hundred fifty-seven".