857705849 has 48 divisors (see below), whose sum is σ = 1183976640. Its totient is φ = 610727040.

The previous prime is 857705839. The next prime is 857705851. The reversal of 857705849 is 948507758.

It is not a de Polignac number, because 857705849 - 2⁸ = 857705593 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 857705849.

It is not an unprimeable number, because it can be changed into a prime (857705819) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 763202 + ... + 764324.

It is an arithmetic number, because the mean of its divisors is an integer number (24666180).

Almost surely, 2^857705849 is an apocalyptic number.

It is an amenable number.

857705849 is a deficient number, since it is larger than the sum of its proper divisors (326270791).

857705849 is a wasteful number, since it uses less digits than its factorization.

857705849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1270 (or 1263 counting only the distinct ones).

The product of its (nonzero) digits is 2822400, while the sum is 53.

The square root of 857705849 is about 29286.6155265507. The cubic root of 857705849 is about 950.1221815152.

It can be divided in two parts, 85770 and 5849, that added together give a palindrome (91619).

The spelling of 857705849 in words is "eight hundred fifty-seven million, seven hundred five thousand, eight hundred forty-nine".