18255863 has 2 divisors, whose sum is σ = 18255864. Its totient is φ = 18255862.

The previous prime is 18255857. The next prime is 18255889. The reversal of 18255863 is 36855281.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18255863 - 2⁶ = 18255799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18255833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9127931 + 9127932.

It is an arithmetic number, because the mean of its divisors is an integer number (9127932).

Almost surely, 2^18255863 is an apocalyptic number.

18255863 is a deficient number, since it is larger than the sum of its proper divisors (1).

18255863 is an equidigital number, since it uses as much as digits as its factorization.

18255863 is an evil number, because the sum of its binary digits is even.

The product of its digits is 57600, while the sum is 38.

The square root of 18255863 is about 4272.6880298004. The cubic root of 18255863 is about 263.3100623920.

The spelling of 18255863 in words is "eighteen million, two hundred fifty-five thousand, eight hundred sixty-three".