209541996 has 18 divisors (see below), whose sum is σ = 529675692. Its totient is φ = 69847320.

The previous prime is 209541991. The next prime is 209542001. The reversal of 209541996 is 699145902.

It is an interprime number because it is at equal distance from previous prime (209541991) and next prime (209542001).

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (209541991) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 2910270 + ... + 2910341.

Almost surely, 2^209541996 is an apocalyptic number.

It is an amenable number.

209541996 is an abundant number, since it is smaller than the sum of its proper divisors (320133696).

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

209541996 is a wasteful number, since it uses less digits than its factorization.

209541996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5820621 (or 5820616 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 45.

The square root of 209541996 is about 14475.5654811824. The cubic root of 209541996 is about 593.9597632848.

The spelling of 209541996 in words is "two hundred nine million, five hundred forty-one thousand, nine hundred ninety-six".