7865257 has 2 divisors, whose sum is σ = 7865258. Its totient is φ = 7865256.

The previous prime is 7865171. The next prime is 7865261. The reversal of 7865257 is 7525687.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7376656 + 488601 = 2716^2 + 699^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7865257 is a prime.

It is not a weakly prime, because it can be changed into another prime (7865267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3932628 + 3932629.

It is an arithmetic number, because the mean of its divisors is an integer number (3932629).

Almost surely, 2^7865257 is an apocalyptic number.

It is an amenable number.

7865257 is a deficient number, since it is larger than the sum of its proper divisors (1).

7865257 is an equidigital number, since it uses as much as digits as its factorization.

7865257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 117600, while the sum is 40.

The square root of 7865257 is about 2804.5065519624. The cubic root of 7865257 is about 198.8707779538.

The spelling of 7865257 in words is "seven million, eight hundred sixty-five thousand, two hundred fifty-seven".