1989856 has 24 divisors (see below), whose sum is σ = 4274424. Its totient is φ = 904320.

The previous prime is 1989847. The next prime is 1989863. The reversal of 1989856 is 6589891.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2475 + ... + 3178.

It is an arithmetic number, because the mean of its divisors is an integer number (178101).

2^1989856 is an apocalyptic number.

1989856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1989856 is an abundant number, since it is smaller than the sum of its proper divisors (2284568).

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

1989856 is a wasteful number, since it uses less digits than its factorization.

1989856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5674 (or 5666 counting only the distinct ones).

The product of its digits is 155520, while the sum is 46.

The square root of 1989856 is about 1410.6225575965. The cubic root of 1989856 is about 125.7787331891.

The spelling of 1989856 in words is "one million, nine hundred eighty-nine thousand, eight hundred fifty-six".