3921844 has 12 divisors (see below), whose sum is σ = 7100100. Its totient is φ = 1893248.

The previous prime is 3921823. The next prime is 3921851. The reversal of 3921844 is 4481293.

It can be written as a sum of positive squares in 2 ways, for example, as 2131600 + 1790244 = 1460^2 + 1338^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16789 + ... + 17020.

It is an arithmetic number, because the mean of its divisors is an integer number (591675).

Almost surely, 2^3921844 is an apocalyptic number.

It is an amenable number.

3921844 is a deficient number, since it is larger than the sum of its proper divisors (3178256).

3921844 is a wasteful number, since it uses less digits than its factorization.

3921844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33842 (or 33840 counting only the distinct ones).

The product of its digits is 6912, while the sum is 31.

The square root of 3921844 is about 1980.3646128933. The cubic root of 3921844 is about 157.6994232089.

The spelling of 3921844 in words is "three million, nine hundred twenty-one thousand, eight hundred forty-four".