181994118 has 16 divisors (see below), whose sum is σ = 375730176. Its totient is φ = 58707720.

The previous prime is 181994107. The next prime is 181994119. The reversal of 181994118 is 811499181.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 181994118.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181994119) 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 7 ways as a sum of consecutive naturals, for example, 489046 + ... + 489417.

It is an arithmetic number, because the mean of its divisors is an integer number (23483136).

Almost surely, 2^181994118 is an apocalyptic number.

181994118 is an abundant number, since it is smaller than the sum of its proper divisors (193736058).

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

181994118 is a wasteful number, since it uses less digits than its factorization.

181994118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 978499.

The product of its digits is 20736, while the sum is 42.

The square root of 181994118 is about 13490.5195600466. The cubic root of 181994118 is about 566.6990056900.

The spelling of 181994118 in words is "one hundred eighty-one million, nine hundred ninety-four thousand, one hundred eighteen".