18324973 has 2 divisors, whose sum is σ = 18324974. Its totient is φ = 18324972.

The previous prime is 18324967. The next prime is 18325001. The reversal of 18324973 is 37942381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14722569 + 3602404 = 3837^2 + 1898^2 .

It is a cyclic number.

It is not a de Polignac number, because 18324973 - 2⁵ = 18324941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18324913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9162486 + 9162487.

It is an arithmetic number, because the mean of its divisors is an integer number (9162487).

Almost surely, 2^18324973 is an apocalyptic number.

It is an amenable number.

18324973 is a deficient number, since it is larger than the sum of its proper divisors (1).

18324973 is an equidigital number, since it uses as much as digits as its factorization.

18324973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36288, while the sum is 37.

The square root of 18324973 is about 4280.7678049621. The cubic root of 18324973 is about 263.6419090932.

The spelling of 18324973 in words is "eighteen million, three hundred twenty-four thousand, nine hundred seventy-three".