381366388 has 48 divisors (see below), whose sum is σ = 734952960. Its totient is φ = 172080000.

The previous prime is 381366367. The next prime is 381366397. The reversal of 381366388 is 883663183.

381366388 is digitally balanced in base 3 and base 9, because in such bases it contains all the possibile digits an equal number of times.

381366388 is strictly pandigital in base 9.

It is a congruent number.

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, 795933 + ... + 796411.

It is an arithmetic number, because the mean of its divisors is an integer number (15311520).

Almost surely, 2^381366388 is an apocalyptic number.

It is an amenable number.

381366388 is a deficient number, since it is larger than the sum of its proper divisors (353586572).

381366388 is a wasteful number, since it uses less digits than its factorization.

381366388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 808 (or 806 counting only the distinct ones).

The product of its digits is 497664, while the sum is 46.

The square root of 381366388 is about 19528.6043536142. The cubic root of 381366388 is about 725.1827604255.

The spelling of 381366388 in words is "three hundred eighty-one million, three hundred sixty-six thousand, three hundred eighty-eight".