18236157 has 16 divisors (see below), whose sum is σ = 25280640. Its totient is φ = 11678912.

The previous prime is 18236149. The next prime is 18236159. The reversal of 18236157 is 75163281.

It is a cyclic number.

It is not a de Polignac number, because 18236157 - 2³ = 18236149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18236159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22483 + ... + 23279.

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

Almost surely, 2^18236157 is an apocalyptic number.

It is an amenable number.

18236157 is a deficient number, since it is larger than the sum of its proper divisors (7044483).

18236157 is a wasteful number, since it uses less digits than its factorization.

18236157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1092.

The product of its digits is 10080, while the sum is 33.

The square root of 18236157 is about 4270.3813647027. The cubic root of 18236157 is about 263.2152863339.

The spelling of 18236157 in words is "eighteen million, two hundred thirty-six thousand, one hundred fifty-seven".