209900970 has 56 divisors (see below), whose sum is σ = 566493156. Its totient is φ = 55971648.

The previous prime is 209900959. The next prime is 209900987. The reversal of 209900970 is 79009902.

It can be written as a sum of positive squares in 2 ways, for example, as 202464441 + 7436529 = 14229^2 + 2727^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 7107 + ... + 21686.

Almost surely, 2^209900970 is an apocalyptic number.

209900970 is an abundant number, since it is smaller than the sum of its proper divisors (356592186).

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

209900970 is an equidigital number, since it uses as much as digits as its factorization.

209900970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28818 (or 28803 counting only the distinct ones).

The product of its (nonzero) digits is 10206, while the sum is 36.

The square root of 209900970 is about 14487.9594836540. The cubic root of 209900970 is about 594.2987477935.

The spelling of 209900970 in words is "two hundred nine million, nine hundred thousand, nine hundred seventy".