381933 has 6 divisors (see below), whose sum is σ = 551694. Its totient is φ = 254616.

The previous prime is 381917. The next prime is 381937. The reversal of 381933 is 339183.

It can be written as a sum of positive squares in only one way, i.e., 381924 + 9 = 618^2 + 3^2 .

It is not a de Polignac number, because 381933 - 2⁴ = 381917 is a prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 381897 and 381906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21210 + ... + 21227.

It is an arithmetic number, because the mean of its divisors is an integer number (91949).

2³⁸¹⁹³³ is an apocalyptic number.

It is an amenable number.

381933 is a deficient number, since it is larger than the sum of its proper divisors (169761).

381933 is a wasteful number, since it uses less digits than its factorization.

381933 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42443 (or 42440 counting only the distinct ones).

The product of its digits is 1944, while the sum is 27.

The square root of 381933 is about 618.0072815105. The cubic root of 381933 is about 72.5541727497.

The spelling of 381933 in words is "three hundred eighty-one thousand, nine hundred thirty-three".