209828867 has 2 divisors, whose sum is σ = 209828868. Its totient is φ = 209828866.

The previous prime is 209828851. The next prime is 209828873. The reversal of 209828867 is 768828902.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 209828867 - 2⁴ = 209828851 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (209828167) 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 as a sum of consecutive naturals, namely, 104914433 + 104914434.

It is an arithmetic number, because the mean of its divisors is an integer number (104914434).

Almost surely, 2^209828867 is an apocalyptic number.

209828867 is a deficient number, since it is larger than the sum of its proper divisors (1).

209828867 is an equidigital number, since it uses as much as digits as its factorization.

209828867 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 774144, while the sum is 50.

The square root of 209828867 is about 14485.4708932779. The cubic root of 209828867 is about 594.2306908901.

The spelling of 209828867 in words is "two hundred nine million, eight hundred twenty-eight thousand, eight hundred sixty-seven".