7721393 has 2 divisors, whose sum is σ = 7721394. Its totient is φ = 7721392.

The previous prime is 7721377. The next prime is 7721401. The reversal of 7721393 is 3931277.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7333264 + 388129 = 2708^2 + 623^2 .

It is a cyclic number.

It is not a de Polignac number, because 7721393 - 2⁴ = 7721377 is a prime.

It is not a weakly prime, because it can be changed into another prime (7721303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3860696 + 3860697.

It is an arithmetic number, because the mean of its divisors is an integer number (3860697).

Almost surely, 2^7721393 is an apocalyptic number.

It is an amenable number.

7721393 is a deficient number, since it is larger than the sum of its proper divisors (1).

7721393 is an equidigital number, since it uses as much as digits as its factorization.

7721393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7938, while the sum is 32.

The square root of 7721393 is about 2778.7394624182. The cubic root of 7721393 is about 197.6507890803.

The spelling of 7721393 in words is "seven million, seven hundred twenty-one thousand, three hundred ninety-three".