722289 has 4 divisors (see below), whose sum is σ = 963056. Its totient is φ = 481524.

The previous prime is 722287. The next prime is 722291. The reversal of 722289 is 982227.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 982227 = 3 ⋅327409.

It is an interprime number because it is at equal distance from previous prime (722287) and next prime (722291).

It is not a de Polignac number, because 722289 - 2¹ = 722287 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (722287) 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, 120379 + ... + 120384.

It is an arithmetic number, because the mean of its divisors is an integer number (240764).

2⁷²²²⁸⁹ is an apocalyptic number.

It is an amenable number.

722289 is a deficient number, since it is larger than the sum of its proper divisors (240767).

722289 is a wasteful number, since it uses less digits than its factorization.

722289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240766.

The product of its digits is 4032, while the sum is 30.

The square root of 722289 is about 849.8758732897. The cubic root of 722289 is about 89.7229753391.

The spelling of 722289 in words is "seven hundred twenty-two thousand, two hundred eighty-nine".