1989846 has 40 divisors (see below), whose sum is σ = 4547664. Its totient is φ = 650160.

The previous prime is 1989811. The next prime is 1989847. The reversal of 1989846 is 6489891.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1989847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 11416 + ... + 11588.

2^1989846 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1989846, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2273832).

1989846 is an abundant number, since it is smaller than the sum of its proper divisors (2557818).

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

1989846 is a wasteful number, since it uses less digits than its factorization.

1989846 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258 (or 249 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 1989846 is about 1410.6190130577. The cubic root of 1989846 is about 125.7785224889.

Adding to 1989846 its sum of digits (45), we get a palindrome (1989891).

The spelling of 1989846 in words is "one million, nine hundred eighty-nine thousand, eight hundred forty-six".