985990 has 16 divisors (see below), whose sum is σ = 1816848. Its totient is φ = 385056.

The previous prime is 985981. The next prime is 985991. The reversal of 985990 is 99589.

985990 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (985991) by changing a digit.

985990 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 717 + ... + 1576.

It is an arithmetic number, because the mean of its divisors is an integer number (113553).

2⁹⁸⁵⁹⁹⁰ is an apocalyptic number.

985990 is a deficient number, since it is larger than the sum of its proper divisors (830858).

985990 is a wasteful number, since it uses less digits than its factorization.

985990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2343.

The product of its (nonzero) digits is 29160, while the sum is 40.

The square root of 985990 is about 992.9702915999. The cubic root of 985990 is about 99.5308019752.

The spelling of 985990 in words is "nine hundred eighty-five thousand, nine hundred ninety".