1985166 has 24 divisors (see below), whose sum is σ = 4450680. Its totient is φ = 638736.

The previous prime is 1985077. The next prime is 1985167. The reversal of 1985166 is 6615891.

It is a self number, because there is not a number n which added to its sum of digits gives 1985166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1985167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1380 + ... + 2423.

It is an arithmetic number, because the mean of its divisors is an integer number (185445).

2^1985166 is an apocalyptic number.

1985166 is an abundant number, since it is smaller than the sum of its proper divisors (2465514).

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

1985166 is a wasteful number, since it uses less digits than its factorization.

1985166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3840 (or 3837 counting only the distinct ones).

The product of its digits is 12960, while the sum is 36.

The square root of 1985166 is about 1408.9591903245. The cubic root of 1985166 is about 125.6798372013.

The spelling of 1985166 in words is "one million, nine hundred eighty-five thousand, one hundred sixty-six".