7221940 has 48 divisors (see below), whose sum is σ = 17527104. Its totient is φ = 2470400.

The previous prime is 7221937. The next prime is 7221953. The reversal of 7221940 is 491227.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2775 + ... + 4705.

It is an arithmetic number, because the mean of its divisors is an integer number (365148).

Almost surely, 2^7221940 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7221940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8763552).

7221940 is an abundant number, since it is smaller than the sum of its proper divisors (10305164).

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

7221940 is a wasteful number, since it uses less digits than its factorization.

7221940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1968 (or 1966 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 7221940 is about 2687.3667408822. The cubic root of 7221940 is about 193.2938154135.

It can be divided in two parts, 722 and 1940, that added together give a palindrome (2662).

The spelling of 7221940 in words is "seven million, two hundred twenty-one thousand, nine hundred forty".