985821 has 8 divisors (see below), whose sum is σ = 1336224. Its totient is φ = 646320.

The previous prime is 985819. The next prime is 985867. The reversal of 985821 is 128589.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 985821 - 2¹ = 985819 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 985821.

It is not an unprimeable number, because it can be changed into a prime (985871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2511 + ... + 2876.

It is an arithmetic number, because the mean of its divisors is an integer number (167028).

2⁹⁸⁵⁸²¹ is an apocalyptic number.

It is an amenable number.

985821 is a deficient number, since it is larger than the sum of its proper divisors (350403).

985821 is a wasteful number, since it uses less digits than its factorization.

985821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5451.

The product of its digits is 5760, while the sum is 33.

The square root of 985821 is about 992.8851897375. The cubic root of 985821 is about 99.5251150796.

The spelling of 985821 in words is "nine hundred eighty-five thousand, eight hundred twenty-one".