181994544 has 60 divisors (see below), whose sum is σ = 511648800. Its totient is φ = 60388992.

The previous prime is 181994543. The next prime is 181994569. The reversal of 181994544 is 445499181.

It is a happy number.

181994544 is a `hidden beast` number, since 1 + 8 + 19 + 94 + 544 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 181994544.

It is not an unprimeable number, because it can be changed into a prime (181994543) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30217 + ... + 35735.

It is an arithmetic number, because the mean of its divisors is an integer number (8527480).

Almost surely, 2^181994544 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 181994544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (255824400).

181994544 is an abundant number, since it is smaller than the sum of its proper divisors (329654256).

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

181994544 is a wasteful number, since it uses less digits than its factorization.

181994544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5762 (or 5753 counting only the distinct ones).

The product of its digits is 207360, while the sum is 45.

The square root of 181994544 is about 13490.5353489029. The cubic root of 181994544 is about 566.6994478537.

The spelling of 181994544 in words is "one hundred eighty-one million, nine hundred ninety-four thousand, five hundred forty-four".