18268157 has 2 divisors, whose sum is σ = 18268158. Its totient is φ = 18268156.

The previous prime is 18268123. The next prime is 18268171. The reversal of 18268157 is 75186281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12013156 + 6255001 = 3466^2 + 2501^2 .

It is an emirp because it is prime and its reverse (75186281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18268157 - 2⁸ = 18267901 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18268157.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18267157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9134078 + 9134079.

It is an arithmetic number, because the mean of its divisors is an integer number (9134079).

Almost surely, 2^18268157 is an apocalyptic number.

It is an amenable number.

18268157 is a deficient number, since it is larger than the sum of its proper divisors (1).

18268157 is an equidigital number, since it uses as much as digits as its factorization.

18268157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 26880, while the sum is 38.

The square root of 18268157 is about 4274.1264604595. The cubic root of 18268157 is about 263.3691558737.

The spelling of 18268157 in words is "eighteen million, two hundred sixty-eight thousand, one hundred fifty-seven".