7247721 has 16 divisors (see below), whose sum is σ = 10955840. Its totient is φ = 4224960.

The previous prime is 7247719. The next prime is 7247731. The reversal of 7247721 is 1277427.

It is not a de Polignac number, because 7247721 - 2¹ = 7247719 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (7247701) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4150 + ... + 5631.

It is an arithmetic number, because the mean of its divisors is an integer number (684740).

Almost surely, 2^7247721 is an apocalyptic number.

It is an amenable number.

7247721 is a deficient number, since it is larger than the sum of its proper divisors (3708119).

7247721 is a wasteful number, since it uses less digits than its factorization.

7247721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9816.

The product of its digits is 5488, while the sum is 30.

The square root of 7247721 is about 2692.1591706287. The cubic root of 7247721 is about 193.5235500719.

The spelling of 7247721 in words is "seven million, two hundred forty-seven thousand, seven hundred twenty-one".