7480721 has 2 divisors, whose sum is σ = 7480722. Its totient is φ = 7480720.

The previous prime is 7480687. The next prime is 7480723. The reversal of 7480721 is 1270847.

7480721 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7230721 + 250000 = 2689^2 + 500^2 .

It is a cyclic number.

It is not a de Polignac number, because 7480721 - 2⁶ = 7480657 is a prime.

It is a super-2 number, since 2×7480721² = 111922373359682, which contains 22 as substring.

Together with 7480723, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (7480723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3740360 + 3740361.

It is an arithmetic number, because the mean of its divisors is an integer number (3740361).

Almost surely, 2^7480721 is an apocalyptic number.

It is an amenable number.

7480721 is a deficient number, since it is larger than the sum of its proper divisors (1).

7480721 is an equidigital number, since it uses as much as digits as its factorization.

7480721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3136, while the sum is 29.

The square root of 7480721 is about 2735.0906749137. The cubic root of 7480721 is about 195.5755165121.

The spelling of 7480721 in words is "seven million, four hundred eighty thousand, seven hundred twenty-one".