3891644 has 12 divisors (see below), whose sum is σ = 6846000. Its totient is φ = 1935648.

The previous prime is 3891593. The next prime is 3891659. The reversal of 3891644 is 4461983.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1649 + ... + 3240.

It is an arithmetic number, because the mean of its divisors is an integer number (570500).

Almost surely, 2^3891644 is an apocalyptic number.

It is an amenable number.

3891644 is a deficient number, since it is larger than the sum of its proper divisors (2954356).

3891644 is a wasteful number, since it uses less digits than its factorization.

3891644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5092 (or 5090 counting only the distinct ones).

The product of its digits is 20736, while the sum is 35.

The square root of 3891644 is about 1972.7250188508. The cubic root of 3891644 is about 157.2935937330.

The spelling of 3891644 in words is "three million, eight hundred ninety-one thousand, six hundred forty-four".