18255397 has 2 divisors, whose sum is σ = 18255398. Its totient is φ = 18255396.

The previous prime is 18255383. The next prime is 18255401. The reversal of 18255397 is 79355281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16695396 + 1560001 = 4086^2 + 1249^2 .

It is a cyclic number.

It is not a de Polignac number, because 18255397 - 2¹¹ = 18253349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18255337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9127698 + 9127699.

It is an arithmetic number, because the mean of its divisors is an integer number (9127699).

Almost surely, 2^18255397 is an apocalyptic number.

It is an amenable number.

18255397 is a deficient number, since it is larger than the sum of its proper divisors (1).

18255397 is an equidigital number, since it uses as much as digits as its factorization.

18255397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 75600, while the sum is 40.

The square root of 18255397 is about 4272.6334970367. The cubic root of 18255397 is about 263.3078219513.

The spelling of 18255397 in words is "eighteen million, two hundred fifty-five thousand, three hundred ninety-seven".