857244384 has 120 divisors (see below), whose sum is σ = 2537849160. Its totient is φ = 283855104.

The previous prime is 857244371. The next prime is 857244391. The reversal of 857244384 is 483442758.

It is a happy number.

857244384 is a `hidden beast` number, since 8 + 572 + 44 + 38 + 4 = 666.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 421482 + ... + 423510.

It is an arithmetic number, because the mean of its divisors is an integer number (21148743).

Almost surely, 2^857244384 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 857244384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1268924580).

857244384 is an abundant number, since it is smaller than the sum of its proper divisors (1680604776).

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

857244384 is a wasteful number, since it uses less digits than its factorization.

857244384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2214 (or 2197 counting only the distinct ones).

The product of its digits is 860160, while the sum is 45.

The square root of 857244384 is about 29278.7360382924. The cubic root of 857244384 is about 949.9517552600.

The spelling of 857244384 in words is "eight hundred fifty-seven million, two hundred forty-four thousand, three hundred eighty-four".