381899728 has 60 divisors (see below), whose sum is σ = 898201440. Its totient is φ = 156547776.

The previous prime is 381899723. The next prime is 381899737. The reversal of 381899728 is 827998183.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381899723) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7443 + ... + 28621.

It is an arithmetic number, because the mean of its divisors is an integer number (14970024).

Almost surely, 2^381899728 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 381899728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (449100720).

381899728 is an abundant number, since it is smaller than the sum of its proper divisors (516301712).

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

381899728 is a wasteful number, since it uses less digits than its factorization.

381899728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21224 (or 21211 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 55.

The square root of 381899728 is about 19542.2549364192. The cubic root of 381899728 is about 725.5206584216.

The spelling of 381899728 in words is "three hundred eighty-one million, eight hundred ninety-nine thousand, seven hundred twenty-eight".