181860 has 48 divisors (see below), whose sum is σ = 583296. Its totient is φ = 41472.

The previous prime is 181837. The next prime is 181871. The reversal of 181860 is 68181.

It is a self number, because there is not a number n which added to its sum of digits gives 181860.

It is an unprimeable number.

181860 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 204 + ... + 636.

It is an arithmetic number, because the mean of its divisors is an integer number (12152).

2¹⁸¹⁸⁶⁰ is an apocalyptic number.

181860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 181860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (291648).

181860 is an abundant number, since it is smaller than the sum of its proper divisors (401436).

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

181860 is a wasteful number, since it uses less digits than its factorization.

181860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452 (or 450 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 24.

The square root of 181860 is about 426.4504660567. The cubic root of 181860 is about 56.6559764532.

Subtracting from 181860 its product of nonzero digits (384), we obtain a square (181476 = 426²).

The spelling of 181860 in words is "one hundred eighty-one thousand, eight hundred sixty".