381644 has 12 divisors (see below), whose sum is σ = 677544. Its totient is φ = 188064.

The previous prime is 381637. The next prime is 381659. The reversal of 381644 is 446183.

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, 362 + ... + 945.

It is an arithmetic number, because the mean of its divisors is an integer number (56462).

2³⁸¹⁶⁴⁴ is an apocalyptic number.

It is an amenable number.

381644 is a deficient number, since it is larger than the sum of its proper divisors (295900).

381644 is a wasteful number, since it uses less digits than its factorization.

381644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1384 (or 1382 counting only the distinct ones).

The product of its digits is 2304, while the sum is 26.

The square root of 381644 is about 617.7734212476. The cubic root of 381644 is about 72.5358681021.

The spelling of 381644 in words is "three hundred eighty-one thousand, six hundred forty-four".