825407857 has 2 divisors, whose sum is σ = 825407858. Its totient is φ = 825407856.

The previous prime is 825407839. The next prime is 825407893. The reversal of 825407857 is 758704528.

825407857 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 729054001 + 96353856 = 27001^2 + 9816^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-825407857 is a prime.

It is not a weakly prime, because it can be changed into another prime (825407057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 412703928 + 412703929.

It is an arithmetic number, because the mean of its divisors is an integer number (412703929).

Almost surely, 2^825407857 is an apocalyptic number.

It is an amenable number.

825407857 is a deficient number, since it is larger than the sum of its proper divisors (1).

825407857 is an equidigital number, since it uses as much as digits as its factorization.

825407857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 627200, while the sum is 46.

The square root of 825407857 is about 28729.9122344639. The cubic root of 825407857 is about 938.0432575677.

The spelling of 825407857 in words is "eight hundred twenty-five million, four hundred seven thousand, eight hundred fifty-seven".