18349939 has 2 divisors, whose sum is σ = 18349940. Its totient is φ = 18349938.

The previous prime is 18349927. The next prime is 18349963. The reversal of 18349939 is 93994381.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18349939 - 2¹³ = 18341747 is a prime.

It is a super-2 number, since 2×18349939² = 673440522607442, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18349979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9174969 + 9174970.

It is an arithmetic number, because the mean of its divisors is an integer number (9174970).

Almost surely, 2^18349939 is an apocalyptic number.

18349939 is a deficient number, since it is larger than the sum of its proper divisors (1).

18349939 is an equidigital number, since it uses as much as digits as its factorization.

18349939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 209952, while the sum is 46.

The square root of 18349939 is about 4283.6828780852. The cubic root of 18349939 is about 263.7615836126.

The spelling of 18349939 in words is "eighteen million, three hundred forty-nine thousand, nine hundred thirty-nine".