1999885 has 16 divisors (see below), whose sum is σ = 2499840. Its totient is φ = 1535040.

The previous prime is 1999871. The next prime is 1999889. The reversal of 1999885 is 5889991.

It is a happy number.

It is not a de Polignac number, because 1999885 - 2⁵ = 1999853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1999889) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24054 + ... + 24136.

It is an arithmetic number, because the mean of its divisors is an integer number (156240).

2^1999885 is an apocalyptic number.

It is an amenable number.

1999885 is a deficient number, since it is larger than the sum of its proper divisors (499955).

1999885 is an equidigital number, since it uses as much as digits as its factorization.

1999885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228.

The product of its digits is 233280, while the sum is 49.

The square root of 1999885 is about 1414.1729031487. The cubic root of 1999885 is about 125.9896900945.

The spelling of 1999885 in words is "one million, nine hundred ninety-nine thousand, eight hundred eighty-five".