858239 has 2 divisors, whose sum is σ = 858240. Its totient is φ = 858238.

The previous prime is 858233. The next prime is 858241. The reversal of 858239 is 932858.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 858239 - 2⁴ = 858223 is a prime.

It is a super-2 number, since 2×858239² = 1473148362242, which contains 22 as substring.

Together with 858241, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 858199 and 858208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (858233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 429119 + 429120.

It is an arithmetic number, because the mean of its divisors is an integer number (429120).

2⁸⁵⁸²³⁹ is an apocalyptic number.

858239 is a deficient number, since it is larger than the sum of its proper divisors (1).

858239 is an equidigital number, since it uses as much as digits as its factorization.

858239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 35.

The square root of 858239 is about 926.4118954331. The cubic root of 858239 is about 95.0319006440.

The spelling of 858239 in words is "eight hundred fifty-eight thousand, two hundred thirty-nine".