381287844 has 48 divisors (see below), whose sum is σ = 1129744000. Its totient is φ = 108939168.

The previous prime is 381287843. The next prime is 381287861. The reversal of 381287844 is 448782183.

381287844 is digitally balanced in base 3 and base 9, because in such bases it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

381287844 is strictly pandigital in base 9.

It is a self number, because there is not a number n which added to its sum of digits gives 381287844.

It is not an unprimeable number, because it can be changed into a prime (381287843) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 251419 + ... + 252930.

Almost surely, 2^381287844 is an apocalyptic number.

It is an amenable number.

381287844 is an abundant number, since it is smaller than the sum of its proper divisors (748456156).

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

381287844 is a wasteful number, since it uses less digits than its factorization.

381287844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 504369 (or 504361 counting only the distinct ones).

The product of its digits is 344064, while the sum is 45.

The square root of 381287844 is about 19526.5932512561. The cubic root of 381287844 is about 725.1329722014.

The spelling of 381287844 in words is "three hundred eighty-one million, two hundred eighty-seven thousand, eight hundred forty-four".