18038539 has 2 divisors, whose sum is σ = 18038540. Its totient is φ = 18038538.

The previous prime is 18038533. The next prime is 18038557. The reversal of 18038539 is 93583081.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18038539 - 2¹⁹ = 17514251 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 18038498 and 18038507.

It is not a weakly prime, because it can be changed into another prime (18038533) 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, 9019269 + 9019270.

It is an arithmetic number, because the mean of its divisors is an integer number (9019270).

Almost surely, 2^18038539 is an apocalyptic number.

18038539 is a deficient number, since it is larger than the sum of its proper divisors (1).

18038539 is an equidigital number, since it uses as much as digits as its factorization.

18038539 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 18038539 is about 4247.1801233289. The cubic root of 18038539 is about 262.2610445236.

The spelling of 18038539 in words is "eighteen million, thirty-eight thousand, five hundred thirty-nine".