18398899 has 2 divisors, whose sum is σ = 18398900. Its totient is φ = 18398898.

The previous prime is 18398857. The next prime is 18398911. The reversal of 18398899 is 99889381.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18398899 - 2¹⁷ = 18267827 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18398599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9199449 + 9199450.

It is an arithmetic number, because the mean of its divisors is an integer number (9199450).

Almost surely, 2^18398899 is an apocalyptic number.

18398899 is a deficient number, since it is larger than the sum of its proper divisors (1).

18398899 is an equidigital number, since it uses as much as digits as its factorization.

18398899 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1119744, while the sum is 55.

The square root of 18398899 is about 4289.3937800113. The cubic root of 18398899 is about 263.9959585776.

The spelling of 18398899 in words is "eighteen million, three hundred ninety-eight thousand, eight hundred ninety-nine".