1001844 has 36 divisors (see below), whose sum is σ = 2683044. Its totient is φ = 314112.

The previous prime is 1001839. The next prime is 1001911. The reversal of 1001844 is 4481001.

It can be written as a sum of positive squares in 2 ways, for example, as 345744 + 656100 = 588^2 + 810^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

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 11 ways as a sum of consecutive naturals, for example, 207 + ... + 1430.

It is an arithmetic number, because the mean of its divisors is an integer number (74529).

2^1001844 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 1001844, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1341522).

1001844 is an abundant number, since it is smaller than the sum of its proper divisors (1681200).

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

1001844 is a wasteful number, since it uses less digits than its factorization.

1001844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1664 (or 1659 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 1001844 is about 1000.9215753494. The cubic root of 1001844 is about 100.0614289238.

Adding to 1001844 its reverse (4481001), we get a palindrome (5482845).

The spelling of 1001844 in words is "one million, one thousand, eight hundred forty-four".