181996 has 12 divisors (see below), whose sum is σ = 321552. Its totient is φ = 90128.

The previous prime is 181981. The next prime is 181997. The reversal of 181996 is 699181.

181996 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (181997) by changing a digit.

181996 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 3 ways as a sum of consecutive naturals, for example, 561 + ... + 823.

It is an arithmetic number, because the mean of its divisors is an integer number (26796).

2¹⁸¹⁹⁹⁶ is an apocalyptic number.

It is an amenable number.

181996 is a deficient number, since it is larger than the sum of its proper divisors (139556).

181996 is a wasteful number, since it uses less digits than its factorization.

181996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440 (or 438 counting only the distinct ones).

The product of its digits is 3888, while the sum is 34.

The square root of 181996 is about 426.6098920560. The cubic root of 181996 is about 56.6700959093.

The spelling of 181996 in words is "one hundred eighty-one thousand, nine hundred ninety-six".