18398911 has 2 divisors, whose sum is σ = 18398912. Its totient is φ = 18398910.

The previous prime is 18398899. The next prime is 18398917. The reversal of 18398911 is 11989381.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18398911 - 2¹¹ = 18396863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18398917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9199455 + 9199456.

It is an arithmetic number, because the mean of its divisors is an integer number (9199456).

Almost surely, 2^18398911 is an apocalyptic number.

18398911 is a deficient number, since it is larger than the sum of its proper divisors (1).

18398911 is an equidigital number, since it uses as much as digits as its factorization.

18398911 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 40.

The square root of 18398911 is about 4289.3951788102. The cubic root of 18398911 is about 263.9960159714.

The spelling of 18398911 in words is "eighteen million, three hundred ninety-eight thousand, nine hundred eleven".