7746721 has 2 divisors, whose sum is σ = 7746722. Its totient is φ = 7746720.

The previous prime is 7746719. The next prime is 7746763. The reversal of 7746721 is 1276477.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7507600 + 239121 = 2740^2 + 489^2 .

It is a cyclic number.

It is not a de Polignac number, because 7746721 - 2¹ = 7746719 is a prime.

Together with 7746719, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (7746701) 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, 3873360 + 3873361.

It is an arithmetic number, because the mean of its divisors is an integer number (3873361).

Almost surely, 2^7746721 is an apocalyptic number.

It is an amenable number.

7746721 is a deficient number, since it is larger than the sum of its proper divisors (1).

7746721 is an equidigital number, since it uses as much as digits as its factorization.

7746721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16464, while the sum is 34.

The square root of 7746721 is about 2783.2931933233. The cubic root of 7746721 is about 197.8666670274.

The spelling of 7746721 in words is "seven million, seven hundred forty-six thousand, seven hundred twenty-one".