722239 has 4 divisors (see below), whose sum is σ = 825424. Its totient is φ = 619056.

The previous prime is 722237. The next prime is 722243. The reversal of 722239 is 932227.

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

It is a cyclic number.

It is not a de Polignac number, because 722239 - 2¹ = 722237 is a prime.

It is a Duffinian number.

722239 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (722237) 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, 51582 + ... + 51595.

It is an arithmetic number, because the mean of its divisors is an integer number (206356).

2⁷²²²³⁹ is an apocalyptic number.

722239 is a deficient number, since it is larger than the sum of its proper divisors (103185).

722239 is a wasteful number, since it uses less digits than its factorization.

722239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103184.

The product of its digits is 1512, while the sum is 25.

The square root of 722239 is about 849.8464567203. The cubic root of 722239 is about 89.7209049526.

It can be divided in two parts, 722 and 239, that added together give a square (961 = 31²).

The spelling of 722239 in words is "seven hundred twenty-two thousand, two hundred thirty-nine".