18304939 has 2 divisors, whose sum is σ = 18304940. Its totient is φ = 18304938.

The previous prime is 18304933. The next prime is 18304963. The reversal of 18304939 is 93940381.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18304939 - 2³ = 18304931 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18304898 and 18304907.

It is not a weakly prime, because it can be changed into another prime (18304931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9152469 + 9152470.

It is an arithmetic number, because the mean of its divisors is an integer number (9152470).

Almost surely, 2^18304939 is an apocalyptic number.

18304939 is a deficient number, since it is larger than the sum of its proper divisors (1).

18304939 is an equidigital number, since it uses as much as digits as its factorization.

18304939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 18304939 is about 4278.4271642743. The cubic root of 18304939 is about 263.5457974832.

The spelling of 18304939 in words is "eighteen million, three hundred four thousand, nine hundred thirty-nine".