822729 has 4 divisors (see below), whose sum is σ = 1096976. Its totient is φ = 548484.

The previous prime is 822727. The next prime is 822739. The reversal of 822729 is 927228.

822729 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 822729 - 2¹ = 822727 is a prime.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 822696 and 822705.

It is not an unprimeable number, because it can be changed into a prime (822721) 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, 137119 + ... + 137124.

It is an arithmetic number, because the mean of its divisors is an integer number (274244).

2⁸²²⁷²⁹ is an apocalyptic number.

It is an amenable number.

822729 is a deficient number, since it is larger than the sum of its proper divisors (274247).

822729 is a wasteful number, since it uses less digits than its factorization.

822729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274246.

The product of its digits is 4032, while the sum is 30.

The square root of 822729 is about 907.0441003612. The cubic root of 822729 is about 93.7027352863.

It can be divided in two parts, 8227 and 29, that added together give a triangular number (8256 = T₁₂₈).

The spelling of 822729 in words is "eight hundred twenty-two thousand, seven hundred twenty-nine".