381966 has 32 divisors (see below), whose sum is σ = 846720. Its totient is φ = 114144.

The previous prime is 381949. The next prime is 381977. The reversal of 381966 is 669183.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4561 + ... + 4643.

It is an arithmetic number, because the mean of its divisors is an integer number (26460).

2³⁸¹⁹⁶⁶ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 381966, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (423360).

381966 is an abundant number, since it is smaller than the sum of its proper divisors (464754).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

381966 is a wasteful number, since it uses less digits than its factorization.

381966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160.

The product of its digits is 7776, while the sum is 33.

The square root of 381966 is about 618.0339796484. The cubic root of 381966 is about 72.5562623123.

The spelling of 381966 in words is "three hundred eighty-one thousand, nine hundred sixty-six".