381998 has 8 divisors (see below), whose sum is σ = 575640. Its totient is φ = 190120.

The previous prime is 381991. The next prime is 382001. The reversal of 381998 is 899183.

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

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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 533 + ... + 1023.

It is an arithmetic number, because the mean of its divisors is an integer number (71955).

2³⁸¹⁹⁹⁸ is an apocalyptic number.

381998 is a deficient number, since it is larger than the sum of its proper divisors (193642).

381998 is a wasteful number, since it uses less digits than its factorization.

381998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 882.

The product of its digits is 15552, while the sum is 38.

The square root of 381998 is about 618.0598676504. The cubic root of 381998 is about 72.5582884399.

The spelling of 381998 in words is "three hundred eighty-one thousand, nine hundred ninety-eight".