7221726 has 24 divisors (see below), whose sum is σ = 15756624. Its totient is φ = 2390400.

The previous prime is 7221707. The next prime is 7221733. The reversal of 7221726 is 6271227.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 7221726.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1390 + ... + 4046.

It is an arithmetic number, because the mean of its divisors is an integer number (656526).

Almost surely, 2^7221726 is an apocalyptic number.

7221726 is an abundant number, since it is smaller than the sum of its proper divisors (8534898).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7221726 is a wasteful number, since it uses less digits than its factorization.

7221726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2816 (or 2813 counting only the distinct ones).

The product of its digits is 2352, while the sum is 27.

The square root of 7221726 is about 2687.3269246595. The cubic root of 7221726 is about 193.2919061719.

The spelling of 7221726 in words is "seven million, two hundred twenty-one thousand, seven hundred twenty-six".