722891 has 8 divisors (see below), whose sum is σ = 824544. Its totient is φ = 627840.

The previous prime is 722881. The next prime is 722899. The reversal of 722891 is 198227.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 722891 - 2¹⁴ = 706507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (722899) 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 7 ways as a sum of consecutive naturals, for example, 1415 + ... + 1856.

It is an arithmetic number, because the mean of its divisors is an integer number (103068).

2⁷²²⁸⁹¹ is an apocalyptic number.

722891 is a deficient number, since it is larger than the sum of its proper divisors (101653).

722891 is a wasteful number, since it uses less digits than its factorization.

722891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3301.

The product of its digits is 2016, while the sum is 29.

The square root of 722891 is about 850.2299688908. The cubic root of 722891 is about 89.7478952960.

The spelling of 722891 in words is "seven hundred twenty-two thousand, eight hundred ninety-one".