381166 has 4 divisors (see below), whose sum is σ = 571752. Its totient is φ = 190582.

The previous prime is 381103. The next prime is 381167. The reversal of 381166 is 661183.

381166 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 381166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381167) by changing a digit.

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 as a sum of consecutive naturals, namely, 95290 + ... + 95293.

It is an arithmetic number, because the mean of its divisors is an integer number (142938).

2³⁸¹¹⁶⁶ is an apocalyptic number.

381166 is a deficient number, since it is larger than the sum of its proper divisors (190586).

381166 is a wasteful number, since it uses less digits than its factorization.

381166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190585.

The product of its digits is 864, while the sum is 25.

The square root of 381166 is about 617.3864268025. The cubic root of 381166 is about 72.5055723026.

The spelling of 381166 in words is "three hundred eighty-one thousand, one hundred sixty-six".