7720247 has 2 divisors, whose sum is σ = 7720248. Its totient is φ = 7720246.

The previous prime is 7720241. The next prime is 7720283. The reversal of 7720247 is 7420277.

7720247 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (7420277) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7720247 - 2⁶ = 7720183 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7720241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3860123 + 3860124.

It is an arithmetic number, because the mean of its divisors is an integer number (3860124).

Almost surely, 2^7720247 is an apocalyptic number.

7720247 is a deficient number, since it is larger than the sum of its proper divisors (1).

7720247 is an equidigital number, since it uses as much as digits as its factorization.

7720247 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5488, while the sum is 29.

The square root of 7720247 is about 2778.5332461570. The cubic root of 7720247 is about 197.6410102312.

The spelling of 7720247 in words is "seven million, seven hundred twenty thousand, two hundred forty-seven".