381188868 has 48 divisors (see below), whose sum is σ = 939267840. Its totient is φ = 119988000.

The previous prime is 381188839. The next prime is 381188881. The reversal of 381188868 is 868881183.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 381188868.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72943 + ... + 77993.

It is an arithmetic number, because the mean of its divisors is an integer number (19568080).

Almost surely, 2^381188868 is an apocalyptic number.

381188868 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 381188868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (469633920).

381188868 is an abundant number, since it is smaller than the sum of its proper divisors (558078972).

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

381188868 is a wasteful number, since it uses less digits than its factorization.

381188868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5408 (or 5406 counting only the distinct ones).

The product of its digits is 589824, while the sum is 51.

The square root of 381188868 is about 19524.0586969001. The cubic root of 381188868 is about 725.0702226075.

The spelling of 381188868 in words is "three hundred eighty-one million, one hundred eighty-eight thousand, eight hundred sixty-eight".