999239 has 2 divisors, whose sum is σ = 999240. Its totient is φ = 999238.

The previous prime is 999233. The next prime is 999269. The reversal of 999239 is 932999.

It is a weak prime.

It is an emirp because it is prime and its reverse (932999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 999239 - 2⁸ = 998983 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 999196 and 999205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499619 + 499620.

It is an arithmetic number, because the mean of its divisors is an integer number (499620).

2⁹⁹⁹²³⁹ is an apocalyptic number.

999239 is a deficient number, since it is larger than the sum of its proper divisors (1).

999239 is an equidigital number, since it uses as much as digits as its factorization.

999239 is an evil number, because the sum of its binary digits is even.

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

The square root of 999239 is about 999.6194275823. The cubic root of 999239 is about 99.9746268959.

The spelling of 999239 in words is "nine hundred ninety-nine thousand, two hundred thirty-nine".