181808244 has 36 divisors (see below), whose sum is σ = 462405216. Its totient is φ = 60229008.

The previous prime is 181808213. The next prime is 181808281. The reversal of 181808244 is 442808181.

It is a happy number.

181808244 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 181808199 and 181808208.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9624 + ... + 21359.

Almost surely, 2^181808244 is an apocalyptic number.

It is an amenable number.

181808244 is an abundant number, since it is smaller than the sum of its proper divisors (280596972).

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

181808244 is a wasteful number, since it uses less digits than its factorization.

181808244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31156 (or 31151 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 36.

The square root of 181808244 is about 13483.6287400685. The cubic root of 181808244 is about 566.5060132047.

The spelling of 181808244 in words is "one hundred eighty-one million, eight hundred eight thousand, two hundred forty-four".