381967808 has 56 divisors (see below), whose sum is σ = 810341280. Its totient is φ = 178196480.

The previous prime is 381967801. The next prime is 381967819. The reversal of 381967808 is 808769183.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381967801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57188 + ... + 63516.

It is an arithmetic number, because the mean of its divisors is an integer number (14470380).

Almost surely, 2^381967808 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 381967808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (405170640).

381967808 is an abundant number, since it is smaller than the sum of its proper divisors (428373472).

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

381967808 is a wasteful number, since it uses less digits than its factorization.

381967808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6405 (or 6395 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 50.

The square root of 381967808 is about 19543.9967253374. The cubic root of 381967808 is about 725.5637679152.

The spelling of 381967808 in words is "three hundred eighty-one million, nine hundred sixty-seven thousand, eight hundred eight".