18959 has 2 divisors, whose sum is σ = 18960. Its totient is φ = 18958.

The previous prime is 18947. The next prime is 18973. The reversal of 18959 is 95981.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18959 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9479 + 9480.

It is an arithmetic number, because the mean of its divisors is an integer number (9480).

2¹⁸⁹⁵⁹ is an apocalyptic number.

18959 is a deficient number, since it is larger than the sum of its proper divisors (1).

18959 is an equidigital number, since it uses as much as digits as its factorization.

18959 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3240, while the sum is 32.

The square root of 18959 is about 137.6916845710. The cubic root of 18959 is about 26.6648088984.

The spelling of 18959 in words is "eighteen thousand, nine hundred fifty-nine".