381845646 has 48 divisors (see below), whose sum is σ = 1018259424. Its totient is φ = 100706112.

The previous prime is 381845621. The next prime is 381845647. The reversal of 381845646 is 646548183.

381845646 is a `hidden beast` number, since 3 + 8 + 1 + 84 + 564 + 6 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381845647) 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 23 ways as a sum of consecutive naturals, for example, 114921 + ... + 118196.

It is an arithmetic number, because the mean of its divisors is an integer number (21213738).

Almost surely, 2^381845646 is an apocalyptic number.

381845646 is an abundant number, since it is smaller than the sum of its proper divisors (636413778).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

381845646 is a wasteful number, since it uses less digits than its factorization.

381845646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233145 (or 233142 counting only the distinct ones).

The product of its digits is 552960, while the sum is 45.

The square root of 381845646 is about 19540.8711678881. The cubic root of 381845646 is about 725.4864090644.

The spelling of 381845646 in words is "three hundred eighty-one million, eight hundred forty-five thousand, six hundred forty-six".