7222709 has 4 divisors (see below), whose sum is σ = 7778316. Its totient is φ = 6667104.

The previous prime is 7222687. The next prime is 7222723. The reversal of 7222709 is 9072227.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2316484 + 4906225 = 1522^2 + 2215^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7222709 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7222729) 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, 277784 + ... + 277809.

It is an arithmetic number, because the mean of its divisors is an integer number (1944579).

Almost surely, 2^7222709 is an apocalyptic number.

It is an amenable number.

7222709 is a deficient number, since it is larger than the sum of its proper divisors (555607).

7222709 is a wasteful number, since it uses less digits than its factorization.

7222709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 555606.

The product of its (nonzero) digits is 3528, while the sum is 29.

The square root of 7222709 is about 2687.5098139356. The cubic root of 7222709 is about 193.3006758817.

The spelling of 7222709 in words is "seven million, two hundred twenty-two thousand, seven hundred nine".