381666132 has 72 divisors (see below), whose sum is σ = 991291392. Its totient is φ = 123758400.

The previous prime is 381666113. The next prime is 381666169. The reversal of 381666132 is 231666183.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 322582 + ... + 323762.

It is an arithmetic number, because the mean of its divisors is an integer number (13767936).

Almost surely, 2^381666132 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 381666132, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (495645696).

381666132 is an abundant number, since it is smaller than the sum of its proper divisors (609625260).

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

381666132 is a wasteful number, since it uses less digits than its factorization.

381666132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1429 (or 1424 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 381666132 is about 19536.2773321838. The cubic root of 381666132 is about 725.3727022279.

The spelling of 381666132 in words is "three hundred eighty-one million, six hundred sixty-six thousand, one hundred thirty-two".