18399371 has 2 divisors, whose sum is σ = 18399372. Its totient is φ = 18399370.

The previous prime is 18399361. The next prime is 18399377. The reversal of 18399371 is 17399381.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18399371 - 2¹⁸ = 18137227 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18399377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9199685 + 9199686.

It is an arithmetic number, because the mean of its divisors is an integer number (9199686).

Almost surely, 2^18399371 is an apocalyptic number.

18399371 is a deficient number, since it is larger than the sum of its proper divisors (1).

18399371 is an equidigital number, since it uses as much as digits as its factorization.

18399371 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40824, while the sum is 41.

The square root of 18399371 is about 4289.4487990883. The cubic root of 18399371 is about 263.9982160501.

The spelling of 18399371 in words is "eighteen million, three hundred ninety-nine thousand, three hundred seventy-one".