705839 has 4 divisors (see below), whose sum is σ = 728640. Its totient is φ = 683040.

The previous prime is 705833. The next prime is 705841. The reversal of 705839 is 938507.

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

It is a cyclic number.

It is not a de Polignac number, because 705839 - 2¹⁶ = 640303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (705833) 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 3 ways as a sum of consecutive naturals, for example, 11354 + ... + 11415.

It is an arithmetic number, because the mean of its divisors is an integer number (182160).

2⁷⁰⁵⁸³⁹ is an apocalyptic number.

705839 is a deficient number, since it is larger than the sum of its proper divisors (22801).

705839 is a wasteful number, since it uses less digits than its factorization.

705839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22800.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 705839 is about 840.1422498601. The cubic root of 705839 is about 89.0365964885.

The spelling of 705839 in words is "seven hundred five thousand, eight hundred thirty-nine".