722861 has 4 divisors (see below), whose sum is σ = 729372. Its totient is φ = 716352.

The previous prime is 722849. The next prime is 722881. The reversal of 722861 is 168227.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8836 + 714025 = 94^2 + 845^2 .

It is a cyclic number.

It is not a de Polignac number, because 722861 - 2⁶ = 722797 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 722861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (722881) 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, 3086 + ... + 3311.

It is an arithmetic number, because the mean of its divisors is an integer number (182343).

2⁷²²⁸⁶¹ is an apocalyptic number.

It is an amenable number.

722861 is a deficient number, since it is larger than the sum of its proper divisors (6511).

722861 is a wasteful number, since it uses less digits than its factorization.

722861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6510.

The product of its digits is 1344, while the sum is 26.

The square root of 722861 is about 850.2123264221. The cubic root of 722861 is about 89.7466537653.

The spelling of 722861 in words is "seven hundred twenty-two thousand, eight hundred sixty-one".