722539 has 2 divisors, whose sum is σ = 722540. Its totient is φ = 722538.

The previous prime is 722537. The next prime is 722563. The reversal of 722539 is 935227.

722539 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 722539 - 2¹ = 722537 is a prime.

Together with 722537, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (722537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 361269 + 361270.

It is an arithmetic number, because the mean of its divisors is an integer number (361270).

2⁷²²⁵³⁹ is an apocalyptic number.

722539 is a deficient number, since it is larger than the sum of its proper divisors (1).

722539 is an equidigital number, since it uses as much as digits as its factorization.

722539 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3780, while the sum is 28.

The square root of 722539 is about 850.0229408669. The cubic root of 722539 is about 89.7333258389.

The spelling of 722539 in words is "seven hundred twenty-two thousand, five hundred thirty-nine".