985643 has 8 divisors (see below), whose sum is σ = 1072512. Its totient is φ = 902016.

The previous prime is 985639. The next prime is 985657. The reversal of 985643 is 346589.

985643 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 985643 - 2² = 985639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (985613) 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, 155 + ... + 1412.

It is an arithmetic number, because the mean of its divisors is an integer number (134064).

2⁹⁸⁵⁶⁴³ is an apocalyptic number.

985643 is a deficient number, since it is larger than the sum of its proper divisors (86869).

985643 is a wasteful number, since it uses less digits than its factorization.

985643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1621.

The product of its digits is 25920, while the sum is 35.

The square root of 985643 is about 992.7955479352. The cubic root of 985643 is about 99.5191246287.

The spelling of 985643 in words is "nine hundred eighty-five thousand, six hundred forty-three".