18304997 has 2 divisors, whose sum is σ = 18304998. Its totient is φ = 18304996.

The previous prime is 18304963. The next prime is 18305009. The reversal of 18304997 is 79940381.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16370116 + 1934881 = 4046^2 + 1391^2 .

It is a cyclic number.

It is not a de Polignac number, because 18304997 - 2⁶ = 18304933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18304907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9152498 + 9152499.

It is an arithmetic number, because the mean of its divisors is an integer number (9152499).

Almost surely, 2^18304997 is an apocalyptic number.

It is an amenable number.

18304997 is a deficient number, since it is larger than the sum of its proper divisors (1).

18304997 is an equidigital number, since it uses as much as digits as its factorization.

18304997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 18304997 is about 4278.4339424607. The cubic root of 18304997 is about 263.5460758350.

The spelling of 18304997 in words is "eighteen million, three hundred four thousand, nine hundred ninety-seven".