381999 has 8 divisors (see below), whose sum is σ = 512512. Its totient is φ = 253080.

The previous prime is 381991. The next prime is 382001. The reversal of 381999 is 999183.

381999 is nontrivially palindromic in base 14.

381999 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 381999 - 2³ = 381991 is a prime.

It is a Duffinian number.

381999 is a modest number, since divided by 999 gives 381 as remainder.

381999 is strictly pandigital in base 7.

It is a congruent number.

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

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 in 7 ways as a sum of consecutive naturals, for example, 384 + ... + 954.

It is an arithmetic number, because the mean of its divisors is an integer number (64064).

2³⁸¹⁹⁹⁹ is an apocalyptic number.

381999 is a deficient number, since it is larger than the sum of its proper divisors (130513).

381999 is a wasteful number, since it uses less digits than its factorization.

381999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 797.

The product of its digits is 17496, while the sum is 39.

The square root of 381999 is about 618.0606766330. The cubic root of 381999 is about 72.5583517546.

The spelling of 381999 in words is "three hundred eighty-one thousand, nine hundred ninety-nine".