7221740 has 24 divisors (see below), whose sum is σ = 15537312. Its totient is φ = 2817920.

The previous prime is 7221737. The next prime is 7221743. The reversal of 7221740 is 471227.

It is an interprime number because it is at equal distance from previous prime (7221737) and next prime (7221743).

It is not an unprimeable number, because it can be changed into a prime (7221743) 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 7 ways as a sum of consecutive naturals, for example, 3584 + ... + 5223.

It is an arithmetic number, because the mean of its divisors is an integer number (647388).

Almost surely, 2^7221740 is an apocalyptic number.

It is an amenable number.

7221740 is an abundant number, since it is smaller than the sum of its proper divisors (8315572).

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

7221740 is a wasteful number, since it uses less digits than its factorization.

7221740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8857 (or 8855 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 23.

The square root of 7221740 is about 2687.3295294772. The cubic root of 7221740 is about 193.2920310767.

Adding to 7221740 its reverse (471227), we get a palindrome (7692967).

It can be divided in two parts, 72 and 21740, that added together give a palindrome (21812).

The spelling of 7221740 in words is "seven million, two hundred twenty-one thousand, seven hundred forty".