381928 has 8 divisors (see below), whose sum is σ = 716130. Its totient is φ = 190960.

The previous prime is 381917. The next prime is 381937. The reversal of 381928 is 829183.

It can be written as a sum of positive squares in only one way, i.e., 381924 + 4 = 618^2 + 2^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 381928.

It is an unprimeable 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, 23863 + ... + 23878.

2³⁸¹⁹²⁸ is an apocalyptic number.

It is an amenable number.

381928 is a deficient number, since it is larger than the sum of its proper divisors (334202).

381928 is a wasteful number, since it uses less digits than its factorization.

381928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47747 (or 47743 counting only the distinct ones).

The product of its digits is 3456, while the sum is 31.

The square root of 381928 is about 618.0032362375. The cubic root of 381928 is about 72.5538561388.

The spelling of 381928 in words is "three hundred eighty-one thousand, nine hundred twenty-eight".