181340244 has 18 divisors (see below), whose sum is σ = 458387930. Its totient is φ = 60446736.

The previous prime is 181340231. The next prime is 181340317. The reversal of 181340244 is 442043181.

181340244 is a `hidden beast` number, since 1 + 81 + 340 + 244 = 666.

It can be written as a sum of positive squares in only one way, i.e., 169520400 + 11819844 = 13020^2 + 3438^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2518579 + ... + 2518650.

Almost surely, 2^181340244 is an apocalyptic number.

It is an amenable number.

181340244 is an abundant number, since it is smaller than the sum of its proper divisors (277047686).

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

181340244 is a wasteful number, since it uses less digits than its factorization.

181340244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5037239 (or 5037234 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 181340244 is about 13466.2631787738. The cubic root of 181340244 is about 566.0195067923.

The spelling of 181340244 in words is "one hundred eighty-one million, three hundred forty thousand, two hundred forty-four".