18380539 has 2 divisors, whose sum is σ = 18380540. Its totient is φ = 18380538.

The previous prime is 18380497. The next prime is 18380563. The reversal of 18380539 is 93508381.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18380539 - 2⁹ = 18380027 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 18380498 and 18380507.

It is not a weakly prime, because it can be changed into another prime (18380569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9190269 + 9190270.

It is an arithmetic number, because the mean of its divisors is an integer number (9190270).

Almost surely, 2^18380539 is an apocalyptic number.

18380539 is a deficient number, since it is larger than the sum of its proper divisors (1).

18380539 is an equidigital number, since it uses as much as digits as its factorization.

18380539 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 18380539 is about 4287.2530832691. The cubic root of 18380539 is about 263.9081167465.

The spelling of 18380539 in words is "eighteen million, three hundred eighty thousand, five hundred thirty-nine".