18418373 has 2 divisors, whose sum is σ = 18418374. Its totient is φ = 18418372.

The previous prime is 18418369. The next prime is 18418399. The reversal of 18418373 is 37381481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14876449 + 3541924 = 3857^2 + 1882^2 .

It is a cyclic number.

It is not a de Polignac number, because 18418373 - 2² = 18418369 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18418303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9209186 + 9209187.

It is an arithmetic number, because the mean of its divisors is an integer number (9209187).

Almost surely, 2^18418373 is an apocalyptic number.

It is an amenable number.

18418373 is a deficient number, since it is larger than the sum of its proper divisors (1).

18418373 is an equidigital number, since it uses as much as digits as its factorization.

18418373 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 35.

The square root of 18418373 is about 4291.6631974096. The cubic root of 18418373 is about 264.0890664050.

The spelling of 18418373 in words is "eighteen million, four hundred eighteen thousand, three hundred seventy-three".