209431080 has 48 divisors (see below), whose sum is σ = 680652180. Its totient is φ = 55848192.

The previous prime is 209431073. The next prime is 209431093. The reversal of 209431080 is 80134902.

209431080 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 194267844 + 15163236 = 13938^2 + 3894^2 .

It is a super-2 number, since 2×209431080² = 87722754539932800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 290517 + ... + 291236.

Almost surely, 2^209431080 is an apocalyptic number.

209431080 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

209431080 is an abundant number, since it is smaller than the sum of its proper divisors (471221100).

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

209431080 is a wasteful number, since it uses less digits than its factorization.

209431080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 581770 (or 581763 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 209431080 is about 14471.7338283980. The cubic root of 209431080 is about 593.8549453649.

Adding to 209431080 its reverse (80134902), we get a palindrome (289565982).

The spelling of 209431080 in words is "two hundred nine million, four hundred thirty-one thousand, eighty".