180209979 has 12 divisors (see below), whose sum is σ = 275615496. Its totient is φ = 113072832.

The previous prime is 180209977. The next prime is 180210001. The reversal of 180209979 is 979902081.

It is not a de Polignac number, because 180209979 - 2¹ = 180209977 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (180209977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 588769 + ... + 589074.

It is an arithmetic number, because the mean of its divisors is an integer number (22967958).

Almost surely, 2^180209979 is an apocalyptic number.

180209979 is a deficient number, since it is larger than the sum of its proper divisors (95405517).

180209979 is a wasteful number, since it uses less digits than its factorization.

180209979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1177866 (or 1177863 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 45.

The square root of 180209979 is about 13424.2310394302. The cubic root of 180209979 is about 564.8410851266.

It can be divided in two parts, 18020997 and 9, that added together give a triangular number (18021006 = T₆₀₀₃).

The spelling of 180209979 in words is "one hundred eighty million, two hundred nine thousand, nine hundred seventy-nine".