17899939 has 2 divisors, whose sum is σ = 17899940. Its totient is φ = 17899938.

The previous prime is 17899933. The next prime is 17899943. The reversal of 17899939 is 93999871.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 17899939 - 2⁵ = 17899907 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 17899939.

It is not a weakly prime, because it can be changed into another prime (17899933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8949969 + 8949970.

It is an arithmetic number, because the mean of its divisors is an integer number (8949970).

Almost surely, 2^17899939 is an apocalyptic number.

17899939 is a deficient number, since it is larger than the sum of its proper divisors (1).

17899939 is an equidigital number, since it uses as much as digits as its factorization.

17899939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1102248, while the sum is 55.

The square root of 17899939 is about 4230.8319512833. The cubic root of 17899939 is about 261.5876182623.

The spelling of 17899939 in words is "seventeen million, eight hundred ninety-nine thousand, nine hundred thirty-nine".