7220844 has 18 divisors (see below), whose sum is σ = 18252780. Its totient is φ = 2406936.

The previous prime is 7220821. The next prime is 7220849. The reversal of 7220844 is 4480227.

It is a tau number, because it is divible by the number of its divisors (18).

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (7220849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 100254 + ... + 100325.

Almost surely, 2^7220844 is an apocalyptic number.

It is an amenable number.

7220844 is an abundant number, since it is smaller than the sum of its proper divisors (11031936).

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

7220844 is a wasteful number, since it uses less digits than its factorization.

7220844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200589 (or 200584 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 27.

The square root of 7220844 is about 2687.1628160571. The cubic root of 7220844 is about 193.2840368434.

The spelling of 7220844 in words is "seven million, two hundred twenty thousand, eight hundred forty-four".