18113943 has 4 divisors (see below), whose sum is σ = 24151928. Its totient is φ = 12075960.

The previous prime is 18113939. The next prime is 18113957. The reversal of 18113943 is 34931181.

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

It is not a de Polignac number, because 18113943 - 2² = 18113939 is a prime.

It is a super-2 number, since 2×18113943² = 656229862014498, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18113943.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18113983) 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, 3018988 + ... + 3018993.

It is an arithmetic number, because the mean of its divisors is an integer number (6037982).

Almost surely, 2^18113943 is an apocalyptic number.

18113943 is a deficient number, since it is larger than the sum of its proper divisors (6037985).

18113943 is an equidigital number, since it uses as much as digits as its factorization.

18113943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6037984.

The product of its digits is 2592, while the sum is 30.

The square root of 18113943 is about 4256.0478145810. The cubic root of 18113943 is about 262.6259676593.

The spelling of 18113943 in words is "eighteen million, one hundred thirteen thousand, nine hundred forty-three".