985820 has 24 divisors (see below), whose sum is σ = 2258928. Its totient is φ = 358400.

The previous prime is 985819. The next prime is 985867. The reversal of 985820 is 28589.

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 7 ways as a sum of consecutive naturals, for example, 2021 + ... + 2460.

It is an arithmetic number, because the mean of its divisors is an integer number (94122).

2⁹⁸⁵⁸²⁰ is an apocalyptic number.

It is an amenable number.

985820 is an abundant number, since it is smaller than the sum of its proper divisors (1273108).

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

985820 is a wasteful number, since it uses less digits than its factorization.

985820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4501 (or 4499 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 985820 is about 992.8846861544. The cubic root of 985820 is about 99.5250814274.

The spelling of 985820 in words is "nine hundred eighty-five thousand, eight hundred twenty".