805239 has 24 divisors (see below), whose sum is σ = 1301040. Its totient is φ = 476928.

The previous prime is 805223. The next prime is 805241. The reversal of 805239 is 932508.

It is not a de Polignac number, because 805239 - 2⁴ = 805223 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (805219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2769 + ... + 3045.

It is an arithmetic number, because the mean of its divisors is an integer number (54210).

2⁸⁰⁵²³⁹ is an apocalyptic number.

805239 is a deficient number, since it is larger than the sum of its proper divisors (495801).

805239 is a wasteful number, since it uses less digits than its factorization.

805239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319 (or 316 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 805239 is about 897.3511018548. The cubic root of 805239 is about 93.0339799521.

It can be divided in two parts, 8052 and 39, that multiplied together give a triangular number (314028 = T₇₉₂).

The spelling of 805239 in words is "eight hundred five thousand, two hundred thirty-nine".