381429866 has 16 divisors (see below), whose sum is σ = 605642400. Its totient is φ = 179855088.

The previous prime is 381429827. The next prime is 381429869. The reversal of 381429866 is 668924183.

It is a self number, because there is not a number n which added to its sum of digits gives 381429866.

It is not an unprimeable number, because it can be changed into a prime (381429869) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73976 + ... + 78963.

It is an arithmetic number, because the mean of its divisors is an integer number (37852650).

Almost surely, 2^381429866 is an apocalyptic number.

381429866 is a deficient number, since it is larger than the sum of its proper divisors (224212534).

381429866 is a wasteful number, since it uses less digits than its factorization.

381429866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153013.

The product of its digits is 497664, while the sum is 47.

The square root of 381429866 is about 19530.2295429419. The cubic root of 381429866 is about 725.2229934742. Note that the first 3 decimals are identical.

The spelling of 381429866 in words is "three hundred eighty-one million, four hundred twenty-nine thousand, eight hundred sixty-six".