18393157 has 2 divisors, whose sum is σ = 18393158. Its totient is φ = 18393156.

The previous prime is 18393131. The next prime is 18393161. The reversal of 18393157 is 75139381.

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., 12173121 + 6220036 = 3489^2 + 2494^2 .

It is a cyclic number.

It is not a de Polignac number, because 18393157 - 2¹⁵ = 18360389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18393257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9196578 + 9196579.

It is an arithmetic number, because the mean of its divisors is an integer number (9196579).

Almost surely, 2^18393157 is an apocalyptic number.

It is an amenable number.

18393157 is a deficient number, since it is larger than the sum of its proper divisors (1).

18393157 is an equidigital number, since it uses as much as digits as its factorization.

18393157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22680, while the sum is 37.

The square root of 18393157 is about 4288.7244024302. The cubic root of 18393157 is about 263.9684927581.

The spelling of 18393157 in words is "eighteen million, three hundred ninety-three thousand, one hundred fifty-seven".