7221985 has 8 divisors (see below), whose sum is σ = 8684136. Its totient is φ = 5765760.

The previous prime is 7221983. The next prime is 7222001. The reversal of 7221985 is 5891227.

It can be written as a sum of positive squares in 4 ways, for example, as 61009 + 7160976 = 247^2 + 2676^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 7221985 - 2¹ = 7221983 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7221985.

It is not an unprimeable number, because it can be changed into a prime (7221983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1915 + ... + 4255.

It is an arithmetic number, because the mean of its divisors is an integer number (1085517).

Almost surely, 2^7221985 is an apocalyptic number.

It is an amenable number.

7221985 is a deficient number, since it is larger than the sum of its proper divisors (1462151).

7221985 is a wasteful number, since it uses less digits than its factorization.

7221985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2963.

The product of its digits is 10080, while the sum is 34.

The square root of 7221985 is about 2687.3751133774. The cubic root of 7221985 is about 193.2942168848.

The spelling of 7221985 in words is "seven million, two hundred twenty-one thousand, nine hundred eighty-five".