7221945 has 16 divisors (see below), whose sum is σ = 11837952. Its totient is φ = 3757440.

The previous prime is 7221937. The next prime is 7221953. The reversal of 7221945 is 5491227.

It is an interprime number because it is at equal distance from previous prime (7221937) and next prime (7221953).

It is not a de Polignac number, because 7221945 - 2³ = 7221937 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 5257 + ... + 6486.

It is an arithmetic number, because the mean of its divisors is an integer number (739872).

Almost surely, 2^7221945 is an apocalyptic number.

It is an amenable number.

7221945 is a deficient number, since it is larger than the sum of its proper divisors (4616007).

7221945 is a wasteful number, since it uses less digits than its factorization.

7221945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11792.

The product of its digits is 5040, while the sum is 30.

The square root of 7221945 is about 2687.3676711608. The cubic root of 7221945 is about 193.2938600215.

The spelling of 7221945 in words is "seven million, two hundred twenty-one thousand, nine hundred forty-five".