209798027 has 2 divisors, whose sum is σ = 209798028. Its totient is φ = 209798026.

The previous prime is 209798023. The next prime is 209798033. The reversal of 209798027 is 720897902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 209798027 - 2² = 209798023 is a prime.

It is not a weakly prime, because it can be changed into another prime (209798023) 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, 104899013 + 104899014.

It is an arithmetic number, because the mean of its divisors is an integer number (104899014).

Almost surely, 2^209798027 is an apocalyptic number.

209798027 is a deficient number, since it is larger than the sum of its proper divisors (1).

209798027 is an equidigital number, since it uses as much as digits as its factorization.

209798027 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 127008, while the sum is 44.

The square root of 209798027 is about 14484.4063392325. The cubic root of 209798027 is about 594.2015767320.

The spelling of 209798027 in words is "two hundred nine million, seven hundred ninety-eight thousand, twenty-seven".