1985816 has 16 divisors (see below), whose sum is σ = 4255440. Its totient is φ = 851040.

The previous prime is 1985803. The next prime is 1985849. The reversal of 1985816 is 6185891.

It is a self number, because there is not a number n which added to its sum of digits gives 1985816.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17675 + ... + 17786.

It is an arithmetic number, because the mean of its divisors is an integer number (265965).

2^1985816 is an apocalyptic number.

It is an amenable number.

1985816 is an abundant number, since it is smaller than the sum of its proper divisors (2269624).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1985816 is a wasteful number, since it uses less digits than its factorization.

1985816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35474 (or 35470 counting only the distinct ones).

The product of its digits is 17280, while the sum is 38.

The square root of 1985816 is about 1409.1898381694. The cubic root of 1985816 is about 125.6935527596.

The spelling of 1985816 in words is "one million, nine hundred eighty-five thousand, eight hundred sixteen".