18224539 has 2 divisors, whose sum is σ = 18224540. Its totient is φ = 18224538.

The previous prime is 18224519. The next prime is 18224551. The reversal of 18224539 is 93542281.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18224539 - 2²¹ = 16127387 is a prime.

It is not a weakly prime, because it can be changed into another prime (18224509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9112269 + 9112270.

It is an arithmetic number, because the mean of its divisors is an integer number (9112270).

Almost surely, 2^18224539 is an apocalyptic number.

18224539 is a deficient number, since it is larger than the sum of its proper divisors (1).

18224539 is an equidigital number, since it uses as much as digits as its factorization.

18224539 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 34.

The square root of 18224539 is about 4269.0208479229. The cubic root of 18224539 is about 263.1593775362.

The spelling of 18224539 in words is "eighteen million, two hundred twenty-four thousand, five hundred thirty-nine".