381890 has 8 divisors (see below), whose sum is σ = 687420. Its totient is φ = 152752.

The previous prime is 381859. The next prime is 381911. The reversal of 381890 is 98183.

It is a happy number.

381890 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 346921 + 34969 = 589^2 + 187^2 .

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

It is an alternating number because its digits alternate between odd and even.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 381890.

It is an unprimeable number.

381890 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19085 + ... + 19104.

2³⁸¹⁸⁹⁰ is an apocalyptic number.

381890 is a deficient number, since it is larger than the sum of its proper divisors (305530).

381890 is a wasteful number, since it uses less digits than its factorization.

381890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38196.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 381890 is about 617.9724912971. The cubic root of 381890 is about 72.5514498057.

The spelling of 381890 in words is "three hundred eighty-one thousand, eight hundred ninety".