857280793 has 2 divisors, whose sum is σ = 857280794. Its totient is φ = 857280792.

The previous prime is 857280791. The next prime is 857280821. The reversal of 857280793 is 397082758.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 816359184 + 40921609 = 28572^2 + 6397^2 .

It is a cyclic number.

It is not a de Polignac number, because 857280793 - 2¹ = 857280791 is a prime.

Together with 857280791, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (857280791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 428640396 + 428640397.

It is an arithmetic number, because the mean of its divisors is an integer number (428640397).

Almost surely, 2^857280793 is an apocalyptic number.

It is an amenable number.

857280793 is a deficient number, since it is larger than the sum of its proper divisors (1).

857280793 is an equidigital number, since it uses as much as digits as its factorization.

857280793 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 846720, while the sum is 49.

The square root of 857280793 is about 29279.3577969190. The cubic root of 857280793 is about 949.9652038963.

The spelling of 857280793 in words is "eight hundred fifty-seven million, two hundred eighty thousand, seven hundred ninety-three".