8642857 has 2 divisors, whose sum is σ = 8642858. Its totient is φ = 8642856.

The previous prime is 8642849. The next prime is 8642861. The reversal of 8642857 is 7582468.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5216656 + 3426201 = 2284^2 + 1851^2 .

It is a cyclic number.

It is not a de Polignac number, because 8642857 - 2³ = 8642849 is a prime.

8642857 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (8642897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4321428 + 4321429.

It is an arithmetic number, because the mean of its divisors is an integer number (4321429).

Almost surely, 2^8642857 is an apocalyptic number.

It is an amenable number.

8642857 is a deficient number, since it is larger than the sum of its proper divisors (1).

8642857 is an equidigital number, since it uses as much as digits as its factorization.

8642857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 107520, while the sum is 40.

The square root of 8642857 is about 2939.8736367402. The cubic root of 8642857 is about 205.2197287072.

It can be divided in two parts, 864 and 2857, that added together give a square (3721 = 61²).

The spelling of 8642857 in words is "eight million, six hundred forty-two thousand, eight hundred fifty-seven".