381909888 has 48 divisors (see below), whose sum is σ = 1098988800. Its totient is φ = 127302912.

The previous prime is 381909887. The next prime is 381909901. The reversal of 381909888 is 888909183.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381909883) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 164608 + ... + 166911.

It is an arithmetic number, because the mean of its divisors is an integer number (22895600).

Almost surely, 2^381909888 is an apocalyptic number.

It is an amenable number.

381909888 is an abundant number, since it is smaller than the sum of its proper divisors (717078912).

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

381909888 is a wasteful number, since it uses less digits than its factorization.

381909888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331539 (or 331524 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 54.

The square root of 381909888 is about 19542.5148842210. The cubic root of 381909888 is about 725.5270922435.

The spelling of 381909888 in words is "three hundred eighty-one million, nine hundred nine thousand, eight hundred eighty-eight".