381857112 has 128 divisors (see below), whose sum is σ = 1305561600. Its totient is φ = 100704384.

The previous prime is 381857033. The next prime is 381857129. The reversal of 381857112 is 211758183.

381857112 is a `hidden beast` number, since 3 + 81 + 8 + 571 + 1 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9943 + ... + 29369.

It is an arithmetic number, because the mean of its divisors is an integer number (10199700).

Almost surely, 2^381857112 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 381857112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (652780800).

381857112 is an abundant number, since it is smaller than the sum of its proper divisors (923704488).

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

381857112 is a wasteful number, since it uses less digits than its factorization.

381857112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19462 (or 19452 counting only the distinct ones).

The product of its digits is 13440, while the sum is 36.

The square root of 381857112 is about 19541.1645507631. The cubic root of 381857112 is about 725.4936705884.

The spelling of 381857112 in words is "three hundred eighty-one million, eight hundred fifty-seven thousand, one hundred twelve".