209180868 has 24 divisors (see below), whose sum is σ = 525634368. Its totient is φ = 64363296.

The previous prime is 209180863. The next prime is 209180887. The reversal of 209180868 is 868081902.

It is not an unprimeable number, because it can be changed into a prime (209180863) 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, 670296 + ... + 670607.

It is an arithmetic number, because the mean of its divisors is an integer number (21901432).

Almost surely, 2^209180868 is an apocalyptic number.

It is an amenable number.

209180868 is an abundant number, since it is smaller than the sum of its proper divisors (316453500).

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

209180868 is a wasteful number, since it uses less digits than its factorization.

209180868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1340923 (or 1340921 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 42.

The square root of 209180868 is about 14463.0863926065. The cubic root of 209180868 is about 593.6183538533.

The spelling of 209180868 in words is "two hundred nine million, one hundred eighty thousand, eight hundred sixty-eight".