209287130 has 16 divisors (see below), whose sum is σ = 405695304. Its totient is φ = 77275200.

The previous prime is 209287129. The next prime is 209287159. The reversal of 209287130 is 31782902.

It can be written as a sum of positive squares in 4 ways, for example, as 96098809 + 113188321 = 9803^2 + 10639^2 .

It is a super-2 number, since 2×209287130² = 87602205567273800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 804821 + ... + 805080.

Almost surely, 2^209287130 is an apocalyptic number.

209287130 is a deficient number, since it is larger than the sum of its proper divisors (196408174).

209287130 is a wasteful number, since it uses less digits than its factorization.

209287130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1609921.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 209287130 is about 14466.7594851093. The cubic root of 209287130 is about 593.7188544327.

The spelling of 209287130 in words is "two hundred nine million, two hundred eighty-seven thousand, one hundred thirty".