819885 has 16 divisors (see below), whose sum is σ = 1431360. Its totient is φ = 397440.

The previous prime is 819853. The next prime is 819899. The reversal of 819885 is 588918.

It is not a de Polignac number, because 819885 - 2⁵ = 819853 is a prime.

It is a super-2 number, since 2×819885² = 1344422826450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2320 + ... + 2649.

It is an arithmetic number, because the mean of its divisors is an integer number (89460).

2⁸¹⁹⁸⁸⁵ is an apocalyptic number.

It is an amenable number.

819885 is a deficient number, since it is larger than the sum of its proper divisors (611475).

819885 is a wasteful number, since it uses less digits than its factorization.

819885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4988.

The product of its digits is 23040, while the sum is 39.

The square root of 819885 is about 905.4750134598. The cubic root of 819885 is about 93.5946404631.

The spelling of 819885 in words is "eight hundred nineteen thousand, eight hundred eighty-five".