381864066 has 8 divisors (see below), whose sum is σ = 763728144. Its totient is φ = 127288020.

The previous prime is 381864029. The next prime is 381864079. The reversal of 381864066 is 660468183.

It is a happy number.

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

381864066 is an admirable number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31822000 + ... + 31822011.

It is an arithmetic number, because the mean of its divisors is an integer number (95466018).

Almost surely, 2^381864066 is an apocalyptic number.

381864066 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

381864066 is a wasteful number, since it uses less digits than its factorization.

381864066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63644016.

The product of its (nonzero) digits is 165888, while the sum is 42.

The square root of 381864066 is about 19541.3424820302. The cubic root of 381864066 is about 725.4980745501.

The spelling of 381864066 in words is "three hundred eighty-one million, eight hundred sixty-four thousand, sixty-six".