381643845 has 32 divisors (see below), whose sum is σ = 667215360. Its totient is φ = 184741440.

The previous prime is 381643819. The next prime is 381643879. The reversal of 381643845 is 548346183.

It is not a de Polignac number, because 381643845 - 2⁵ = 381643813 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 381643797 and 381643806.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 128386 + ... + 131324.

It is an arithmetic number, because the mean of its divisors is an integer number (20850480).

Almost surely, 2^381643845 is an apocalyptic number.

It is an amenable number.

381643845 is a deficient number, since it is larger than the sum of its proper divisors (285571515).

381643845 is a wasteful number, since it uses less digits than its factorization.

381643845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3745.

The product of its digits is 276480, while the sum is 42.

The square root of 381643845 is about 19535.7069234773. The cubic root of 381643845 is about 725.3585828229.

The spelling of 381643845 in words is "three hundred eighty-one million, six hundred forty-three thousand, eight hundred forty-five".