381538 has 4 divisors (see below), whose sum is σ = 572310. Its totient is φ = 190768.

The previous prime is 381533. The next prime is 381541. The reversal of 381538 is 835183.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 310249 + 71289 = 557^2 + 267^2 .

It is not an unprimeable number, because it can be changed into a prime (381533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95383 + ... + 95386.

2³⁸¹⁵³⁸ is an apocalyptic number.

381538 is a deficient number, since it is larger than the sum of its proper divisors (190772).

381538 is a wasteful number, since it uses less digits than its factorization.

381538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190771.

The product of its digits is 2880, while the sum is 28.

The square root of 381538 is about 617.6876233178. The cubic root of 381538 is about 72.5291519705.

It can be divided in two parts, 381 and 538, that added together give a palindrome (919).

The spelling of 381538 in words is "three hundred eighty-one thousand, five hundred thirty-eight".