722559 has 4 divisors (see below), whose sum is σ = 963416. Its totient is φ = 481704.

The previous prime is 722539. The next prime is 722563. The reversal of 722559 is 955227.

It is a happy number.

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

It is not a de Polignac number, because 722559 - 2⁷ = 722431 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (722509) 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, 120424 + ... + 120429.

It is an arithmetic number, because the mean of its divisors is an integer number (240854).

2⁷²²⁵⁵⁹ is an apocalyptic number.

722559 is a deficient number, since it is larger than the sum of its proper divisors (240857).

722559 is a wasteful number, since it uses less digits than its factorization.

722559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240856.

The product of its digits is 6300, while the sum is 30.

The square root of 722559 is about 850.0347051739. The cubic root of 722559 is about 89.7341537757.

The spelling of 722559 in words is "seven hundred twenty-two thousand, five hundred fifty-nine".