181995912 has 96 divisors (see below), whose sum is σ = 566542080. Its totient is φ = 51701760.

The previous prime is 181995911. The next prime is 181995949. The reversal of 181995912 is 219599181.

It is not an unprimeable number, because it can be changed into a prime (181995911) 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 in 23 ways as a sum of consecutive naturals, for example, 96337 + ... + 98207.

It is an arithmetic number, because the mean of its divisors is an integer number (5901480).

Almost surely, 2^181995912 is an apocalyptic number.

181995912 is a gapful number since it is divisible by the number (12) 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 181995912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (283271040).

181995912 is an abundant number, since it is smaller than the sum of its proper divisors (384546168).

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

181995912 is a wasteful number, since it uses less digits than its factorization.

181995912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2083 (or 2076 counting only the distinct ones).

The product of its digits is 58320, while the sum is 45.

The square root of 181995912 is about 13490.5860510209. The cubic root of 181995912 is about 566.7008677551.

The spelling of 181995912 in words is "one hundred eighty-one million, nine hundred ninety-five thousand, nine hundred twelve".