381967866 has 64 divisors (see below), whose sum is σ = 1027157760. Its totient is φ = 102712320.

The previous prime is 381967853. The next prime is 381967933. The reversal of 381967866 is 668769183.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23295 + ... + 36146.

It is an arithmetic number, because the mean of its divisors is an integer number (16049340).

Almost surely, 2^381967866 is an apocalyptic number.

381967866 is an abundant number, since it is smaller than the sum of its proper divisors (645189894).

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

381967866 is a wasteful number, since it uses less digits than its factorization.

381967866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59476 (or 59470 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 54.

The square root of 381967866 is about 19543.9982091690. The cubic root of 381967866 is about 725.5638046397.

The spelling of 381967866 in words is "three hundred eighty-one million, nine hundred sixty-seven thousand, eight hundred sixty-six".