3995644 has 12 divisors (see below), whose sum is σ = 7006384. Its totient is φ = 1993824.

The previous prime is 3995639. The next prime is 3995647. The reversal of 3995644 is 4465993.

It is a junction number, because it is equal to n+sod(n) for n = 3995597 and 3995606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3995647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3352 + ... + 4384.

Almost surely, 2^3995644 is an apocalyptic number.

It is an amenable number.

3995644 is a deficient number, since it is larger than the sum of its proper divisors (3010740).

3995644 is a wasteful number, since it uses less digits than its factorization.

3995644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2004 (or 2002 counting only the distinct ones).

The product of its digits is 116640, while the sum is 40.

The square root of 3995644 is about 1998.9107033582. The cubic root of 3995644 is about 158.6824616089.

It can be divided in two parts, 39956 and 44, that added together give a square (40000 = 200²).

The spelling of 3995644 in words is "three million, nine hundred ninety-five thousand, six hundred forty-four".