18328539 has 16 divisors (see below), whose sum is σ = 25599744. Its totient is φ = 11642400.

The previous prime is 18328537. The next prime is 18328547. The reversal of 18328539 is 93582381.

It is not a de Polignac number, because 18328539 - 2¹ = 18328537 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18328497 and 18328506.

It is not an unprimeable number, because it can be changed into a prime (18328537) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33609 + ... + 34149.

It is an arithmetic number, because the mean of its divisors is an integer number (1599984).

Almost surely, 2^18328539 is an apocalyptic number.

18328539 is a deficient number, since it is larger than the sum of its proper divisors (7271205).

18328539 is a wasteful number, since it uses less digits than its factorization.

18328539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1058.

The product of its digits is 51840, while the sum is 39.

The square root of 18328539 is about 4281.1842987659. The cubic root of 18328539 is about 263.6590093652.

The spelling of 18328539 in words is "eighteen million, three hundred twenty-eight thousand, five hundred thirty-nine".