381993 has 4 divisors (see below), whose sum is σ = 509328. Its totient is φ = 254660.

The previous prime is 381991. The next prime is 382001. The reversal of 381993 is 399183.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 381993 - 2¹ = 381991 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (381991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63663 + ... + 63668.

It is an arithmetic number, because the mean of its divisors is an integer number (127332).

2³⁸¹⁹⁹³ is an apocalyptic number.

It is an amenable number.

381993 is a deficient number, since it is larger than the sum of its proper divisors (127335).

381993 is a wasteful number, since it uses less digits than its factorization.

381993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127334.

The product of its digits is 5832, while the sum is 33.

The square root of 381993 is about 618.0558227215. The cubic root of 381993 is about 72.5579718649.

The spelling of 381993 in words is "three hundred eighty-one thousand, nine hundred ninety-three".