381688 has 8 divisors (see below), whose sum is σ = 715680. Its totient is φ = 190840.

The previous prime is 381673. The next prime is 381697. The reversal of 381688 is 886183.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

381688 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23848 + ... + 23863.

It is an arithmetic number, because the mean of its divisors is an integer number (89460).

2³⁸¹⁶⁸⁸ is an apocalyptic number.

It is an amenable number.

381688 is a deficient number, since it is larger than the sum of its proper divisors (333992).

381688 is a wasteful number, since it uses less digits than its factorization.

381688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47717 (or 47713 counting only the distinct ones).

The product of its digits is 9216, while the sum is 34.

The square root of 381688 is about 617.8090319832. The cubic root of 381688 is about 72.5386555651.

The spelling of 381688 in words is "three hundred eighty-one thousand, six hundred eighty-eight".