18385911 has 24 divisors (see below), whose sum is σ = 27221376. Its totient is φ = 11955600.

The previous prime is 18385909. The next prime is 18385919. The reversal of 18385911 is 11958381.

It is not a de Polignac number, because 18385911 - 2¹ = 18385909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18385919) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 112716 + ... + 112878.

It is an arithmetic number, because the mean of its divisors is an integer number (1134224).

Almost surely, 2^18385911 is an apocalyptic number.

18385911 is a deficient number, since it is larger than the sum of its proper divisors (8835465).

18385911 is a wasteful number, since it uses less digits than its factorization.

18385911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403 (or 400 counting only the distinct ones).

The product of its digits is 8640, while the sum is 36.

The square root of 18385911 is about 4287.8795458828. The cubic root of 18385911 is about 263.9338246670.

The spelling of 18385911 in words is "eighteen million, three hundred eighty-five thousand, nine hundred eleven".