381668 has 24 divisors (see below), whose sum is σ = 783552. Its totient is φ = 159264.

The previous prime is 381659. The next prime is 381673. The reversal of 381668 is 866183.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 381668.

It is an unprimeable number.

381668 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1046 + ... + 1362.

It is an arithmetic number, because the mean of its divisors is an integer number (32648).

2³⁸¹⁶⁶⁸ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 381668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (391776).

381668 is an abundant number, since it is smaller than the sum of its proper divisors (401884).

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

381668 is a wasteful number, since it uses less digits than its factorization.

381668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 371 (or 369 counting only the distinct ones).

The product of its digits is 6912, while the sum is 32.

The square root of 381668 is about 617.7928455397. The cubic root of 381668 is about 72.5373885630.

The spelling of 381668 in words is "three hundred eighty-one thousand, six hundred sixty-eight".