181386 has 16 divisors (see below), whose sum is σ = 403200. Its totient is φ = 60444.

The previous prime is 181361. The next prime is 181387. The reversal of 181386 is 683181.

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

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 181386.

It is not an unprimeable number, because it can be changed into a prime (181387) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 1626 + ... + 1733.

It is an arithmetic number, because the mean of its divisors is an integer number (25200).

2¹⁸¹³⁸⁶ is an apocalyptic number.

181386 is an abundant number, since it is smaller than the sum of its proper divisors (221814).

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

181386 is a wasteful number, since it uses less digits than its factorization.

181386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3370 (or 3364 counting only the distinct ones).

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

The square root of 181386 is about 425.8943530971. The cubic root of 181386 is about 56.6067109042.

The spelling of 181386 in words is "one hundred eighty-one thousand, three hundred eighty-six".