7326721 has 2 divisors, whose sum is σ = 7326722. Its totient is φ = 7326720.

The previous prime is 7326713. The next prime is 7326731. The reversal of 7326721 is 1276237.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6948496 + 378225 = 2636^2 + 615^2 .

It is an emirp because it is prime and its reverse (1276237) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7326721 - 2³ = 7326713 is a prime.

It is a super-2 number, since 2×7326721² = 107361681223682, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 7326721.

It is not a weakly prime, because it can be changed into another prime (7326731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3663360 + 3663361.

It is an arithmetic number, because the mean of its divisors is an integer number (3663361).

Almost surely, 2^7326721 is an apocalyptic number.

It is an amenable number.

7326721 is a deficient number, since it is larger than the sum of its proper divisors (1).

7326721 is an equidigital number, since it uses as much as digits as its factorization.

7326721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3528, while the sum is 28.

The square root of 7326721 is about 2706.7916432559. The cubic root of 7326721 is about 194.2241448659.

The spelling of 7326721 in words is "seven million, three hundred twenty-six thousand, seven hundred twenty-one".