180821946 has 16 divisors (see below), whose sum is σ = 373310208. Its totient is φ = 58329600.

The previous prime is 180821939. The next prime is 180821951. The reversal of 180821946 is 649128081.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 485895 + ... + 486266.

It is an arithmetic number, because the mean of its divisors is an integer number (23331888).

Almost surely, 2^180821946 is an apocalyptic number.

180821946 is an abundant number, since it is smaller than the sum of its proper divisors (192488262).

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

180821946 is a wasteful number, since it uses less digits than its factorization.

180821946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 972197.

The product of its (nonzero) digits is 27648, while the sum is 39.

The square root of 180821946 is about 13447.0050940721. The cubic root of 180821946 is about 565.4797356010.

The spelling of 180821946 in words is "one hundred eighty million, eight hundred twenty-one thousand, nine hundred forty-six".