381431808 has 104 divisors (see below), whose sum is σ = 1130358000. Its totient is φ = 127107072.

The previous prime is 381431807. The next prime is 381431833. The reversal of 381431808 is 808134183.

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

It is not an unprimeable number, because it can be changed into a prime (381431803) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108868 + ... + 112316.

Almost surely, 2^381431808 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 381431808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (565179000).

381431808 is an abundant number, since it is smaller than the sum of its proper divisors (748926192).

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

381431808 is an equidigital number, since it uses as much as digits as its factorization.

381431808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3482 (or 3454 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 381431808 is about 19530.2792606762. The cubic root of 381431808 is about 725.2242242646.

The spelling of 381431808 in words is "three hundred eighty-one million, four hundred thirty-one thousand, eight hundred eight".