239999 has 2 divisors, whose sum is σ = 240000. Its totient is φ = 239998.

The previous prime is 239977. The next prime is 240007. The reversal of 239999 is 999932.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-239999 is a prime.

It is a Chen prime.

It is an Ulam number.

239999 is a modest number, since divided by 999 gives 239 as remainder.

It is a plaindrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (239929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119999 + 120000.

It is an arithmetic number, because the mean of its divisors is an integer number (120000).

2²³⁹⁹⁹⁹ is an apocalyptic number.

239999 is a deficient number, since it is larger than the sum of its proper divisors (1).

239999 is an equidigital number, since it uses as much as digits as its factorization.

239999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 39366, while the sum is 41.

The square root of 239999 is about 489.8969279348. The cubic root of 239999 is about 62.1445638069.

The spelling of 239999 in words is "two hundred thirty-nine thousand, nine hundred ninety-nine".