806439 has 4 divisors (see below), whose sum is σ = 1075256. Its totient is φ = 537624.

The previous prime is 806389. The next prime is 806447. The reversal of 806439 is 934608.

806439 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 806439 - 2¹⁶ = 740903 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (806639) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134404 + ... + 134409.

It is an arithmetic number, because the mean of its divisors is an integer number (268814).

2⁸⁰⁶⁴³⁹ is an apocalyptic number.

806439 is a deficient number, since it is larger than the sum of its proper divisors (268817).

806439 is a wasteful number, since it uses less digits than its factorization.

806439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268816.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 806439 is about 898.0194875391. The cubic root of 806439 is about 93.0801713580.

The spelling of 806439 in words is "eight hundred six thousand, four hundred thirty-nine".