857818494 has 48 divisors (see below), whose sum is σ = 2004256800. Its totient is φ = 263590848.

The previous prime is 857818483. The next prime is 857818499. The reversal of 857818494 is 494818758.

857818494 is a `hidden beast` number, since 85 + 78 + 1 + 8 + 494 = 666.

857818494 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 857818494.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (857818499) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 213052 + ... + 217040.

It is an arithmetic number, because the mean of its divisors is an integer number (41755350).

Almost surely, 2^857818494 is an apocalyptic number.

857818494 is an abundant number, since it is smaller than the sum of its proper divisors (1146438306).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

857818494 is a wasteful number, since it uses less digits than its factorization.

857818494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4929 (or 4926 counting only the distinct ones).

The product of its digits is 2580480, while the sum is 54.

The square root of 857818494 is about 29288.5386115456. The cubic root of 857818494 is about 950.1637737962.

It can be divided in two parts, 8578 and 18494, that added together give a palindrome (27072).

The spelling of 857818494 in words is "eight hundred fifty-seven million, eight hundred eighteen thousand, four hundred ninety-four".