181999104 has 80 divisors (see below), whose sum is σ = 554155008. Its totient is φ = 51996672.

The previous prime is 181999073. The next prime is 181999133. The reversal of 181999104 is 401999181.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2289 + ... + 19215.

Almost surely, 2^181999104 is an apocalyptic number.

181999104 is a gapful number since it is divisible by the number (14) 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 181999104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (277077504).

181999104 is an abundant number, since it is smaller than the sum of its proper divisors (372155904).

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

181999104 is an equidigital number, since it uses as much as digits as its factorization.

181999104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16955 (or 16939 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 42.

The square root of 181999104 is about 13490.7043552218. The cubic root of 181999104 is about 566.7041808306.

The spelling of 181999104 in words is "one hundred eighty-one million, nine hundred ninety-nine thousand, one hundred four".