381438266 has 8 divisors (see below), whose sum is σ = 624171744. Its totient is φ = 173381020.

The previous prime is 381438263. The next prime is 381438289. The reversal of 381438266 is 662834183.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (381438263) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8669030 + ... + 8669073.

It is an arithmetic number, because the mean of its divisors is an integer number (78021468).

Almost surely, 2^381438266 is an apocalyptic number.

381438266 is a deficient number, since it is larger than the sum of its proper divisors (242733478).

381438266 is a wasteful number, since it uses less digits than its factorization.

381438266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17338116.

The product of its digits is 165888, while the sum is 41.

The square root of 381438266 is about 19530.4445929938. Note that the first 3 decimals coincide. The cubic root of 381438266 is about 725.2283171514.

The spelling of 381438266 in words is "three hundred eighty-one million, four hundred thirty-eight thousand, two hundred sixty-six".