381855136 has 48 divisors (see below), whose sum is σ = 828473184. Its totient is φ = 172134144.

The previous prime is 381855127. The next prime is 381855143. The reversal of 381855136 is 631558183.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7215 + ... + 28561.

It is an arithmetic number, because the mean of its divisors is an integer number (17259858).

Almost surely, 2^381855136 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 381855136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (414236592).

381855136 is an abundant number, since it is smaller than the sum of its proper divisors (446618048).

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

381855136 is a wasteful number, since it uses less digits than its factorization.

381855136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21413 (or 21405 counting only the distinct ones).

The product of its digits is 86400, while the sum is 40.

The square root of 381855136 is about 19541.1139907632. The cubic root of 381855136 is about 725.4924191796.

The spelling of 381855136 in words is "three hundred eighty-one million, eight hundred fifty-five thousand, one hundred thirty-six".