18113899 has 4 divisors (see below), whose sum is σ = 18126136. Its totient is φ = 18101664.

The previous prime is 18113881. The next prime is 18113929. The reversal of 18113899 is 99831181.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18113899 - 2¹⁵ = 18081131 is a prime.

It is a super-2 number, since 2×18113899² = 656226673964402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18113819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3534 + ... + 6979.

It is an arithmetic number, because the mean of its divisors is an integer number (4531534).

Almost surely, 2^18113899 is an apocalyptic number.

18113899 is a deficient number, since it is larger than the sum of its proper divisors (12237).

18113899 is a wasteful number, since it uses less digits than its factorization.

18113899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12236.

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

The square root of 18113899 is about 4256.0426454630. The cubic root of 18113899 is about 262.6257550137.

The spelling of 18113899 in words is "eighteen million, one hundred thirteen thousand, eight hundred ninety-nine".