381186 has 40 divisors (see below), whose sum is σ = 924924. Its totient is φ = 116640.

The previous prime is 381181. The next prime is 381209. The reversal of 381186 is 681183.

It can be written as a sum of positive squares in 2 ways, for example, as 281961 + 99225 = 531^2 + 315^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an Ulam number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (381181) by changing a digit.

381186 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2016 + ... + 2196.

2³⁸¹¹⁸⁶ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 381186, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (462462).

381186 is an abundant number, since it is smaller than the sum of its proper divisors (543738).

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

381186 is a wasteful number, since it uses less digits than its factorization.

381186 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208 (or 199 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 381186 is about 617.4026239011. The cubic root of 381186 is about 72.5068404168.

The spelling of 381186 in words is "three hundred eighty-one thousand, one hundred eighty-six".