181801444 has 12 divisors (see below), whose sum is σ = 347075568. Its totient is φ = 82637000.

The previous prime is 181801423. The next prime is 181801511. The reversal of 181801444 is 444108181.

It is a super-3 number, since 3×181801444³ (a number of 26 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2065882 + ... + 2065969.

It is an arithmetic number, because the mean of its divisors is an integer number (28922964).

Almost surely, 2^181801444 is an apocalyptic number.

It is an amenable number.

181801444 is a deficient number, since it is larger than the sum of its proper divisors (165274124).

181801444 is a wasteful number, since it uses less digits than its factorization.

181801444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4131866 (or 4131864 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 31.

The square root of 181801444 is about 13483.3765800707. The cubic root of 181801444 is about 566.4989502890.

The spelling of 181801444 in words is "one hundred eighty-one million, eight hundred one thousand, four hundred forty-four".