381856642 has 8 divisors (see below), whose sum is σ = 602931600. Its totient is φ = 180879444.

The previous prime is 381856637. The next prime is 381856681. The reversal of 381856642 is 246658183.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5024392 + ... + 5024467.

It is an arithmetic number, because the mean of its divisors is an integer number (75366450).

Almost surely, 2^381856642 is an apocalyptic number.

381856642 is a deficient number, since it is larger than the sum of its proper divisors (221074958).

381856642 is a wasteful number, since it uses less digits than its factorization.

381856642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10048880.

The product of its digits is 276480, while the sum is 43.

The square root of 381856642 is about 19541.1525248640. The cubic root of 381856642 is about 725.4933729359.

The spelling of 381856642 in words is "three hundred eighty-one million, eight hundred fifty-six thousand, six hundred forty-two".