18113939 has 2 divisors, whose sum is σ = 18113940. Its totient is φ = 18113938.

The previous prime is 18113929. The next prime is 18113957. The reversal of 18113939 is 93931181.

It is a weak prime.

It is an emirp because it is prime and its reverse (93931181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18113939 - 2¹⁶ = 18048403 is a prime.

It is a super-2 number, since 2×18113939² = 656229572191442, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 18113899 and 18113908.

It is not a weakly prime, because it can be changed into another prime (18113929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9056969 + 9056970.

It is an arithmetic number, because the mean of its divisors is an integer number (9056970).

Almost surely, 2^18113939 is an apocalyptic number.

18113939 is a deficient number, since it is larger than the sum of its proper divisors (1).

18113939 is an equidigital number, since it uses as much as digits as its factorization.

18113939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5832, while the sum is 35.

The square root of 18113939 is about 4256.0473446615. The cubic root of 18113939 is about 262.6259483279.

The spelling of 18113939 in words is "eighteen million, one hundred thirteen thousand, nine hundred thirty-nine".