180808138 has 12 divisors (see below), whose sum is σ = 315491922. Its totient is φ = 77489160.

The previous prime is 180808099. The next prime is 180808139. The reversal of 180808138 is 831808081.

It can be written as a sum of positive squares in only one way, i.e., 136492489 + 44315649 = 11683^2 + 6657^2 .

It is a junction number, because it is equal to n+sod(n) for n = 180808097 and 180808106.

It is not an unprimeable number, because it can be changed into a prime (180808139) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 922393 + ... + 922588.

Almost surely, 2^180808138 is an apocalyptic number.

180808138 is a deficient number, since it is larger than the sum of its proper divisors (134683784).

180808138 is a wasteful number, since it uses less digits than its factorization.

180808138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1844997 (or 1844990 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 37.

The square root of 180808138 is about 13446.4916613963. The cubic root of 180808138 is about 565.4653414357.

The spelling of 180808138 in words is "one hundred eighty million, eight hundred eight thousand, one hundred thirty-eight".