18404539 has 2 divisors, whose sum is σ = 18404540. Its totient is φ = 18404538.

The previous prime is 18404513. The next prime is 18404543. The reversal of 18404539 is 93540481.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18404539 - 2¹¹ = 18402491 is a prime.

It is equal to p_1175497 and since 18404539 and 1175497 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (18404509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9202269 + 9202270.

It is an arithmetic number, because the mean of its divisors is an integer number (9202270).

Almost surely, 2^18404539 is an apocalyptic number.

18404539 is a deficient number, since it is larger than the sum of its proper divisors (1).

18404539 is an equidigital number, since it uses as much as digits as its factorization.

18404539 is an odious number, because the sum of its binary digits is odd.

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

The square root of 18404539 is about 4290.0511651961. The cubic root of 18404539 is about 264.0229309359.

The spelling of 18404539 in words is "eighteen million, four hundred four thousand, five hundred thirty-nine".