1981044 has 96 divisors (see below), whose sum is σ = 5927040. Its totient is φ = 566784.

The previous prime is 1981037. The next prime is 1981081. The reversal of 1981044 is 4401891.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 1980999 and 1981017.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23827 + ... + 23909.

It is an arithmetic number, because the mean of its divisors is an integer number (61740).

2^1981044 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1981044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2963520).

1981044 is an abundant number, since it is smaller than the sum of its proper divisors (3945996).

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

1981044 is a wasteful number, since it uses less digits than its factorization.

1981044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126 (or 118 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 1981044 is about 1407.4956483059. The cubic root of 1981044 is about 125.5927896925.

The spelling of 1981044 in words is "one million, nine hundred eighty-one thousand, forty-four".