381664 has 12 divisors (see below), whose sum is σ = 751464. Its totient is φ = 190816.

The previous prime is 381659. The next prime is 381673. The reversal of 381664 is 466183.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5932 + ... + 5995.

It is an arithmetic number, because the mean of its divisors is an integer number (62622).

2³⁸¹⁶⁶⁴ is an apocalyptic number.

It is an amenable number.

381664 is a deficient number, since it is larger than the sum of its proper divisors (369800).

381664 is a wasteful number, since it uses less digits than its factorization.

381664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11937 (or 11929 counting only the distinct ones).

The product of its digits is 3456, while the sum is 28.

The square root of 381664 is about 617.7896082001. The cubic root of 381664 is about 72.5371351573.

The spelling of 381664 in words is "three hundred eighty-one thousand, six hundred sixty-four".