3998644 has 24 divisors (see below), whose sum is σ = 7606368. Its totient is φ = 1828320.

The previous prime is 3998641. The next prime is 3998653. The reversal of 3998644 is 4468993.

3998644 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 3998644.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3998641) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 6519 + ... + 7105.

It is an arithmetic number, because the mean of its divisors is an integer number (316932).

Almost surely, 2^3998644 is an apocalyptic number.

It is an amenable number.

3998644 is a deficient number, since it is larger than the sum of its proper divisors (3607724).

3998644 is a wasteful number, since it uses less digits than its factorization.

3998644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 735 (or 733 counting only the distinct ones).

The product of its digits is 186624, while the sum is 43.

The square root of 3998644 is about 1999.6609712649. The cubic root of 3998644 is about 158.7221655376.

The spelling of 3998644 in words is "three million, nine hundred ninety-eight thousand, six hundred forty-four".