17939 has 2 divisors, whose sum is σ = 17940. Its totient is φ = 17938.

The previous prime is 17929. The next prime is 17957. The reversal of 17939 is 93971.

It is a weak prime.

It is an emirp because it is prime and its reverse (93971) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 17939 - 2⁴ = 17923 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (17909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8969 + 8970.

It is an arithmetic number, because the mean of its divisors is an integer number (8970).

2¹⁷⁹³⁹ is an apocalyptic number.

17939 is a deficient number, since it is larger than the sum of its proper divisors (1).

17939 is an equidigital number, since it uses as much as digits as its factorization.

17939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1701, while the sum is 29.

The square root of 17939 is about 133.9365521432. The cubic root of 17939 is about 26.1777757654.

The spelling of 17939 in words is "seventeen thousand, nine hundred thirty-nine".