722306 has 12 divisors (see below), whose sum is σ = 1173762. Its totient is φ = 333216.

The previous prime is 722299. The next prime is 722311. The reversal of 722306 is 603227.

722306 = T₁₄₀ + T₁₄₁ + ... + T₁₉₁.

It can be written as a sum of positive squares in 3 ways, for example, as 167281 + 555025 = 409^2 + 745^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 731 + ... + 1406.

2⁷²²³⁰⁶ is an apocalyptic number.

722306 is a deficient number, since it is larger than the sum of its proper divisors (451456).

722306 is a wasteful number, since it uses less digits than its factorization.

722306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2165 (or 2152 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 20.

The square root of 722306 is about 849.8858746914. The cubic root of 722306 is about 89.7236792488.

The spelling of 722306 in words is "seven hundred twenty-two thousand, three hundred six".