180444409 has 8 divisors (see below), whose sum is σ = 197647560. Its totient is φ = 163973376.

The previous prime is 180444391. The next prime is 180444413. The reversal of 180444409 is 904444081.

It can be written as a sum of positive squares in 4 ways, for example, as 89718784 + 90725625 = 9472^2 + 9525^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 180444409 - 2⁹ = 180443897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (180444109) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 182514 + ... + 183499.

It is an arithmetic number, because the mean of its divisors is an integer number (24705945).

Almost surely, 2^180444409 is an apocalyptic number.

It is an amenable number.

180444409 is a deficient number, since it is larger than the sum of its proper divisors (17203151).

180444409 is a wasteful number, since it uses less digits than its factorization.

180444409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366059.

The product of its (nonzero) digits is 18432, while the sum is 34.

The square root of 180444409 is about 13432.9598004312. The cubic root of 180444409 is about 565.0859075261.

The spelling of 180444409 in words is "one hundred eighty million, four hundred forty-four thousand, four hundred nine".