381243 has 4 divisors (see below), whose sum is σ = 508328. Its totient is φ = 254160.

The previous prime is 381239. The next prime is 381253. The reversal of 381243 is 342183.

It is a happy number.

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

It is not a de Polignac number, because 381243 - 2² = 381239 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (381223) 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 3 ways as a sum of consecutive naturals, for example, 63538 + ... + 63543.

It is an arithmetic number, because the mean of its divisors is an integer number (127082).

2³⁸¹²⁴³ is an apocalyptic number.

381243 is a deficient number, since it is larger than the sum of its proper divisors (127085).

381243 is a wasteful number, since it uses less digits than its factorization.

381243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127084.

The product of its digits is 576, while the sum is 21.

The square root of 381243 is about 617.4487833011. The cubic root of 381243 is about 72.5104542990.

Subtracting from 381243 its reverse (342183), we obtain a triangular number (39060 = T₂₇₉).

The spelling of 381243 in words is "three hundred eighty-one thousand, two hundred forty-three".