722839 has 4 divisors (see below), whose sum is σ = 778456. Its totient is φ = 667224.

The previous prime is 722833. The next prime is 722849. The reversal of 722839 is 938227.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 938227 = 103 ⋅9109.

It is a cyclic number.

It is not a de Polignac number, because 722839 - 2⁵ = 722807 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 722839.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (722833) 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, 27789 + ... + 27814.

It is an arithmetic number, because the mean of its divisors is an integer number (194614).

2⁷²²⁸³⁹ is an apocalyptic number.

722839 is a deficient number, since it is larger than the sum of its proper divisors (55617).

722839 is a wasteful number, since it uses less digits than its factorization.

722839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55616.

The product of its digits is 6048, while the sum is 31.

The square root of 722839 is about 850.1993883790. The cubic root of 722839 is about 89.7457432876.

The spelling of 722839 in words is "seven hundred twenty-two thousand, eight hundred thirty-nine".