720922 has 4 divisors (see below), whose sum is σ = 1081386. Its totient is φ = 360460.

The previous prime is 720913. The next prime is 720931. The reversal of 720922 is 229027.

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

It is an interprime number because it is at equal distance from previous prime (720913) and next prime (720931).

It can be written as a sum of positive squares in only one way, i.e., 720801 + 121 = 849^2 + 11^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 720893 and 720902.

It is an unprimeable number.

720922 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 180229 + ... + 180232.

2⁷²⁰⁹²² is an apocalyptic number.

720922 is a deficient number, since it is larger than the sum of its proper divisors (360464).

720922 is a wasteful number, since it uses less digits than its factorization.

720922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360463.

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 720922 is about 849.0712573159. The cubic root of 720922 is about 89.6663365306. Note that the first 3 decimals are identical.

Adding to 720922 its reverse (229027), we get a palindrome (949949).

The spelling of 720922 in words is "seven hundred twenty thousand, nine hundred twenty-two".