1985000 has 40 divisors (see below), whose sum is σ = 4662570. Its totient is φ = 792000.

The previous prime is 1984991. The next prime is 1985003. The reversal of 1985000 is 5891.

It can be written as a sum of positive squares in 5 ways, for example, as 75076 + 1909924 = 274^2 + 1382^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (1985003) 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 9 ways as a sum of consecutive naturals, for example, 4802 + ... + 5198.

2^1985000 is an apocalyptic number.

1985000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1985000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2331285).

1985000 is an abundant number, since it is smaller than the sum of its proper divisors (2677570).

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

1985000 is an equidigital number, since it uses as much as digits as its factorization.

1985000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423 (or 404 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 23.

The square root of 1985000 is about 1408.9002803605. The cubic root of 1985000 is about 125.6763339788.

The spelling of 1985000 in words is "one million, nine hundred eighty-five thousand".