722491 has 12 divisors (see below), whose sum is σ = 908656. Its totient is φ = 562320.

The previous prime is 722489. The next prime is 722509. The reversal of 722491 is 194227.

722491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 722491 - 2¹ = 722489 is a prime.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (722411) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 421 + ... + 1273.

2⁷²²⁴⁹¹ is an apocalyptic number.

722491 is a deficient number, since it is larger than the sum of its proper divisors (186165).

722491 is a wasteful number, since it uses less digits than its factorization.

722491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 882 (or 871 counting only the distinct ones).

The product of its digits is 1008, while the sum is 25.

The square root of 722491 is about 849.9947058659. The cubic root of 722491 is about 89.7313387282.

The spelling of 722491 in words is "seven hundred twenty-two thousand, four hundred ninety-one".