18072157 has 2 divisors, whose sum is σ = 18072158. Its totient is φ = 18072156.

The previous prime is 18072149. The next prime is 18072161. The reversal of 18072157 is 75127081.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18071001 + 1156 = 4251^2 + 34^2 .

It is a cyclic number.

It is not a de Polignac number, because 18072157 - 2³ = 18072149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18072557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9036078 + 9036079.

It is an arithmetic number, because the mean of its divisors is an integer number (9036079).

Almost surely, 2^18072157 is an apocalyptic number.

It is an amenable number.

18072157 is a deficient number, since it is larger than the sum of its proper divisors (1).

18072157 is an equidigital number, since it uses as much as digits as its factorization.

18072157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3920, while the sum is 31.

The square root of 18072157 is about 4251.1359658331. The cubic root of 18072157 is about 262.4238666588.

The spelling of 18072157 in words is "eighteen million, seventy-two thousand, one hundred fifty-seven".