209897896 has 16 divisors (see below), whose sum is σ = 423832500. Its totient is φ = 96875904.

The previous prime is 209897893. The next prime is 209897903. The reversal of 209897896 is 698798902.

It can be written as a sum of positive squares in 2 ways, for example, as 204089796 + 5808100 = 14286^2 + 2410^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 209897896.

It is not an unprimeable number, because it can be changed into a prime (209897893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1009021 + ... + 1009228.

Almost surely, 2^209897896 is an apocalyptic number.

209897896 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

209897896 is an abundant number, since it is smaller than the sum of its proper divisors (213934604).

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

209897896 is a wasteful number, since it uses less digits than its factorization.

209897896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2018268 (or 2018264 counting only the distinct ones).

The product of its (nonzero) digits is 3919104, while the sum is 58.

The square root of 209897896 is about 14487.8533951721. The cubic root of 209897896 is about 594.2958466107.

The spelling of 209897896 in words is "two hundred nine million, eight hundred ninety-seven thousand, eight hundred ninety-six".