8240857 has 2 divisors, whose sum is σ = 8240858. Its totient is φ = 8240856.

The previous prime is 8240849. The next prime is 8240861. The reversal of 8240857 is 7580428.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7485696 + 755161 = 2736^2 + 869^2 .

It is a cyclic number.

It is not a de Polignac number, because 8240857 - 2³ = 8240849 is a prime.

It is not a weakly prime, because it can be changed into another prime (8240807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4120428 + 4120429.

It is an arithmetic number, because the mean of its divisors is an integer number (4120429).

Almost surely, 2^8240857 is an apocalyptic number.

It is an amenable number.

8240857 is a deficient number, since it is larger than the sum of its proper divisors (1).

8240857 is an equidigital number, since it uses as much as digits as its factorization.

8240857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17920, while the sum is 34.

The square root of 8240857 is about 2870.6892900486. The cubic root of 8240857 is about 201.9873288787.

The spelling of 8240857 in words is "eight million, two hundred forty thousand, eight hundred fifty-seven".