985905 has 32 divisors (see below), whose sum is σ = 1795200. Its totient is φ = 513216.

The previous prime is 985903. The next prime is 985921. The reversal of 985905 is 509589.

985905 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 985905 - 2¹ = 985903 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 985905.

It is not an unprimeable number, because it can be changed into a prime (985903) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8991 + ... + 9099.

It is an arithmetic number, because the mean of its divisors is an integer number (56100).

2⁹⁸⁵⁹⁰⁵ is an apocalyptic number.

It is an amenable number.

985905 is a deficient number, since it is larger than the sum of its proper divisors (809295).

985905 is a wasteful number, since it uses less digits than its factorization.

985905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190 (or 184 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 36.

The square root of 985905 is about 992.9274897997. The cubic root of 985905 is about 99.5279417835.

The spelling of 985905 in words is "nine hundred eighty-five thousand, nine hundred five".