857940984 has 80 divisors (see below), whose sum is σ = 2407866120. Its totient is φ = 285405120.

The previous prime is 857940977. The next prime is 857940997. The reversal of 857940984 is 489049758.

857940984 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 857940984.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 427327 + ... + 429329.

Almost surely, 2^857940984 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 857940984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1203933060).

857940984 is an abundant number, since it is smaller than the sum of its proper divisors (1549925136).

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

857940984 is a wasteful number, since it uses less digits than its factorization.

857940984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2682 (or 2669 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 54.

The square root of 857940984 is about 29290.6296279203. The cubic root of 857940984 is about 950.2089970466.

The spelling of 857940984 in words is "eight hundred fifty-seven million, nine hundred forty thousand, nine hundred eighty-four".