1989936 has 60 divisors (see below), whose sum is σ = 6003088. Its totient is φ = 611712.

The previous prime is 1989919. The next prime is 1989947. The reversal of 1989936 is 6399891.

It is a nude number because it is divisible by every one of its digits.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 1989891 and 1989900.

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 11 ways as a sum of consecutive naturals, for example, 1341 + ... + 2403.

2^1989936 is an apocalyptic number.

1989936 is a gapful number since it is divisible by the number (16) 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 1989936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3001544).

1989936 is an abundant number, since it is smaller than the sum of its proper divisors (4013152).

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

1989936 is a wasteful number, since it uses less digits than its factorization.

1989936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1090 (or 1081 counting only the distinct ones).

The product of its digits is 104976, while the sum is 45.

The square root of 1989936 is about 1410.6509135856. The cubic root of 1989936 is about 125.7804187656.

Subtracting from 1989936 its sum of digits (45), we obtain a palindrome (1989891).

The spelling of 1989936 in words is "one million, nine hundred eighty-nine thousand, nine hundred thirty-six".