209552136 has 16 divisors (see below), whose sum is σ = 523880400. Its totient is φ = 69850704.

The previous prime is 209552131. The next prime is 209552137. The reversal of 209552136 is 631255902.

It is a junction number, because it is equal to n+sod(n) for n = 209552097 and 209552106.

It is not an unprimeable number, because it can be changed into a prime (209552131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4365646 + ... + 4365693.

It is an arithmetic number, because the mean of its divisors is an integer number (32742525).

Almost surely, 2^209552136 is an apocalyptic number.

It is an amenable number.

209552136 is an abundant number, since it is smaller than the sum of its proper divisors (314328264).

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

209552136 is a wasteful number, since it uses less digits than its factorization.

209552136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8731348 (or 8731344 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 33.

The square root of 209552136 is about 14475.9157223300. The cubic root of 209552136 is about 593.9693439495.

The spelling of 209552136 in words is "two hundred nine million, five hundred fifty-two thousand, one hundred thirty-six".