857984 has 16 divisors (see below), whose sum is σ = 1709520. Its totient is φ = 428928.

The previous prime is 857981. The next prime is 858001. The reversal of 857984 is 489758.

It is a tau number, because it is divible by the number of its divisors (16).

It is a super-2 number, since 2×857984² = 1472273088512, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (857981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3224 + ... + 3479.

It is an arithmetic number, because the mean of its divisors is an integer number (106845).

2⁸⁵⁷⁹⁸⁴ is an apocalyptic number.

It is an amenable number.

857984 is a deficient number, since it is larger than the sum of its proper divisors (851536).

857984 is an equidigital number, since it uses as much as digits as its factorization.

857984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6717 (or 6705 counting only the distinct ones).

The product of its digits is 80640, while the sum is 41.

The square root of 857984 is about 926.2742574421. The cubic root of 857984 is about 95.0224877512.

The spelling of 857984 in words is "eight hundred fifty-seven thousand, nine hundred eighty-four".