7221939 has 12 divisors (see below), whose sum is σ = 9825816. Its totient is φ = 4718272.

The previous prime is 7221937. The next prime is 7221953. The reversal of 7221939 is 9391227.

It is not a de Polignac number, because 7221939 - 2¹ = 7221937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7221937) 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 11 ways as a sum of consecutive naturals, for example, 7999 + ... + 8855.

It is an arithmetic number, because the mean of its divisors is an integer number (818818).

Almost surely, 2^7221939 is an apocalyptic number.

7221939 is a deficient number, since it is larger than the sum of its proper divisors (2603877).

7221939 is an equidigital number, since it uses as much as digits as its factorization.

7221939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 966 (or 913 counting only the distinct ones).

The product of its digits is 6804, while the sum is 33.

The square root of 7221939 is about 2687.3665548265. The cubic root of 7221939 is about 193.2938064919.

The spelling of 7221939 in words is "seven million, two hundred twenty-one thousand, nine hundred thirty-nine".