18340939 has 2 divisors, whose sum is σ = 18340940. Its totient is φ = 18340938.

The previous prime is 18340891. The next prime is 18340957. The reversal of 18340939 is 93904381.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18340939 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18340898 and 18340907.

It is not a weakly prime, because it can be changed into another prime (18340969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9170469 + 9170470.

It is an arithmetic number, because the mean of its divisors is an integer number (9170470).

Almost surely, 2^18340939 is an apocalyptic number.

18340939 is a deficient number, since it is larger than the sum of its proper divisors (1).

18340939 is an equidigital number, since it uses as much as digits as its factorization.

18340939 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 18340939 is about 4282.6322513146. The cubic root of 18340939 is about 263.7184546326.

The spelling of 18340939 in words is "eighteen million, three hundred forty thousand, nine hundred thirty-nine".