985809 has 8 divisors (see below), whose sum is σ = 1433952. Its totient is φ = 597440.

The previous prime is 985807. The next prime is 985819. The reversal of 985809 is 908589.

985809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 985809 - 2¹ = 985807 is a prime.

It is not an unprimeable number, because it can be changed into a prime (985807) 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, 14904 + ... + 14969.

It is an arithmetic number, because the mean of its divisors is an integer number (179244).

2⁹⁸⁵⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

985809 is a deficient number, since it is larger than the sum of its proper divisors (448143).

985809 is a wasteful number, since it uses less digits than its factorization.

985809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29887.

The product of its (nonzero) digits is 25920, while the sum is 39.

The square root of 985809 is about 992.8791467243. The cubic root of 985809 is about 99.5247112516.

It can be divided in two parts, 98580 and 9, that added together give a palindrome (98589).

The spelling of 985809 in words is "nine hundred eighty-five thousand, eight hundred nine".