7316721 has 6 divisors (see below), whose sum is σ = 10568610. Its totient is φ = 4877808.

The previous prime is 7316719. The next prime is 7316723. The reversal of 7316721 is 1276137.

It is an interprime number because it is at equal distance from previous prime (7316719) and next prime (7316723).

It can be written as a sum of positive squares in only one way, i.e., 5574321 + 1742400 = 2361^2 + 1320^2 .

It is not a de Polignac number, because 7316721 - 2¹ = 7316719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (7316723) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 406476 + ... + 406493.

It is an arithmetic number, because the mean of its divisors is an integer number (1761435).

Almost surely, 2^7316721 is an apocalyptic number.

It is an amenable number.

7316721 is a deficient number, since it is larger than the sum of its proper divisors (3251889).

7316721 is a wasteful number, since it uses less digits than its factorization.

7316721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 812975 (or 812972 counting only the distinct ones).

The product of its digits is 1764, while the sum is 27.

The square root of 7316721 is about 2704.9438071797. The cubic root of 7316721 is about 194.1357412561.

The spelling of 7316721 in words is "seven million, three hundred sixteen thousand, seven hundred twenty-one".