816239 has 2 divisors, whose sum is σ = 816240. Its totient is φ = 816238.

The previous prime is 816227. The next prime is 816251. The reversal of 816239 is 932618.

It is a balanced prime because it is at equal distance from previous prime (816227) and next prime (816251).

It is a cyclic number.

It is not a de Polignac number, because 816239 - 2⁴ = 816223 is a prime.

It is a super-2 number, since 2×816239² = 1332492210242, which contains 22 as substring.

It is a Sophie Germain 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 (816209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408119 + 408120.

It is an arithmetic number, because the mean of its divisors is an integer number (408120).

2⁸¹⁶²³⁹ is an apocalyptic number.

816239 is a deficient number, since it is larger than the sum of its proper divisors (1).

816239 is an equidigital number, since it uses as much as digits as its factorization.

816239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 29.

The square root of 816239 is about 903.4594622893. The cubic root of 816239 is about 93.4556969328.

The spelling of 816239 in words is "eight hundred sixteen thousand, two hundred thirty-nine".