381638 has 8 divisors (see below), whose sum is σ = 576288. Its totient is φ = 189544.

The previous prime is 381637. The next prime is 381659. The reversal of 381638 is 836183.

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 a self number, because there is not a number n which added to its sum of digits gives 381638.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 381638.

It is not an unprimeable number, because it can be changed into a prime (381631) 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, 206 + ... + 897.

It is an arithmetic number, because the mean of its divisors is an integer number (72036).

2³⁸¹⁶³⁸ is an apocalyptic number.

381638 is a deficient number, since it is larger than the sum of its proper divisors (194650).

381638 is a wasteful number, since it uses less digits than its factorization.

381638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1278.

The product of its digits is 3456, while the sum is 29.

The square root of 381638 is about 617.7685650792. The cubic root of 381638 is about 72.5354879770.

The spelling of 381638 in words is "three hundred eighty-one thousand, six hundred thirty-eight".