3861644 has 6 divisors (see below), whose sum is σ = 6757884. Its totient is φ = 1930820.

The previous prime is 3861607. The next prime is 3861659. The reversal of 3861644 is 4461683.

It is a self number, because there is not a number n which added to its sum of digits gives 3861644.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 482702 + ... + 482709.

It is an arithmetic number, because the mean of its divisors is an integer number (1126314).

Almost surely, 2^3861644 is an apocalyptic number.

It is an amenable number.

3861644 is a deficient number, since it is larger than the sum of its proper divisors (2896240).

3861644 is a wasteful number, since it uses less digits than its factorization.

3861644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 965415 (or 965413 counting only the distinct ones).

The product of its digits is 13824, while the sum is 32.

The square root of 3861644 is about 1965.1066128839. The cubic root of 3861644 is about 156.8883677756. Note that the first 3 decimals are identical.

The spelling of 3861644 in words is "three million, eight hundred sixty-one thousand, six hundred forty-four".