1989885 has 16 divisors (see below), whose sum is σ = 3245184. Its totient is φ = 1040832.

The previous prime is 1989877. The next prime is 1989899. The reversal of 1989885 is 5889891.

It is not a de Polignac number, because 1989885 - 2³ = 1989877 is a prime.

It is a super-3 number, since 3×1989885³ = 23637698533355187375, which contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 457 + ... + 2046.

It is an arithmetic number, because the mean of its divisors is an integer number (202824).

2^1989885 is an apocalyptic number.

1989885 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1989885 is a deficient number, since it is larger than the sum of its proper divisors (1255299).

1989885 is a wasteful number, since it uses less digits than its factorization.

1989885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2564.

The product of its digits is 207360, while the sum is 48.

The square root of 1989885 is about 1410.6328367084. The cubic root of 1989885 is about 125.7793442158.

The spelling of 1989885 in words is "one million, nine hundred eighty-nine thousand, eight hundred eighty-five".