722917 has 4 divisors (see below), whose sum is σ = 778540. Its totient is φ = 667296.

The previous prime is 722903. The next prime is 722921. The reversal of 722917 is 719227.

It is a happy number.

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 136161 + 586756 = 369^2 + 766^2 .

It is a cyclic number.

It is not a de Polignac number, because 722917 - 2¹¹ = 720869 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 (722977) 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, 27792 + ... + 27817.

It is an arithmetic number, because the mean of its divisors is an integer number (194635).

2⁷²²⁹¹⁷ is an apocalyptic number.

It is an amenable number.

722917 is a deficient number, since it is larger than the sum of its proper divisors (55623).

722917 is a wasteful number, since it uses less digits than its factorization.

722917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55622.

The product of its digits is 1764, while the sum is 28.

The square root of 722917 is about 850.2452587342. The cubic root of 722917 is about 89.7489712615.

The spelling of 722917 in words is "seven hundred twenty-two thousand, nine hundred seventeen".