9720857 has 2 divisors, whose sum is σ = 9720858. Its totient is φ = 9720856.

The previous prime is 9720839. The next prime is 9720863. The reversal of 9720857 is 7580279.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9461776 + 259081 = 3076^2 + 509^2 .

It is a cyclic number.

It is not a de Polignac number, because 9720857 - 2²² = 5526553 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9720857.

It is not a weakly prime, because it can be changed into another prime (9720817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4860428 + 4860429.

It is an arithmetic number, because the mean of its divisors is an integer number (4860429).

Almost surely, 2^9720857 is an apocalyptic number.

It is an amenable number.

9720857 is a deficient number, since it is larger than the sum of its proper divisors (1).

9720857 is an equidigital number, since it uses as much as digits as its factorization.

9720857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 35280, while the sum is 38.

The square root of 9720857 is about 3117.8288920337. The cubic root of 9720857 is about 213.4198702200.

The spelling of 9720857 in words is "nine million, seven hundred twenty thousand, eight hundred fifty-seven".