381856816 has 20 divisors (see below), whose sum is σ = 807106824. Its totient is φ = 173571200.

The previous prime is 381856799. The next prime is 381856829. The reversal of 381856816 is 618658183.

381856816 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1084645 + ... + 1084996.

Almost surely, 2^381856816 is an apocalyptic number.

It is an amenable number.

381856816 is an abundant number, since it is smaller than the sum of its proper divisors (425250008).

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

381856816 is a wasteful number, since it uses less digits than its factorization.

381856816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2169660 (or 2169654 counting only the distinct ones).

The product of its digits is 276480, while the sum is 46.

The square root of 381856816 is about 19541.1569770062. The cubic root of 381856816 is about 725.4934831306.

The spelling of 381856816 in words is "three hundred eighty-one million, eight hundred fifty-six thousand, eight hundred sixteen".