18258959 has 2 divisors, whose sum is σ = 18258960. Its totient is φ = 18258958.

The previous prime is 18258937. The next prime is 18258967. The reversal of 18258959 is 95985281.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18258959 - 2²⁰ = 17210383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18258059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9129479 + 9129480.

It is an arithmetic number, because the mean of its divisors is an integer number (9129480).

Almost surely, 2^18258959 is an apocalyptic number.

18258959 is a deficient number, since it is larger than the sum of its proper divisors (1).

18258959 is an equidigital number, since it uses as much as digits as its factorization.

18258959 is an evil number, because the sum of its binary digits is even.

The product of its digits is 259200, while the sum is 47.

The square root of 18258959 is about 4273.0503156410. The cubic root of 18258959 is about 263.3249464117.

The spelling of 18258959 in words is "eighteen million, two hundred fifty-eight thousand, nine hundred fifty-nine".