209436023 has 2 divisors, whose sum is σ = 209436024. Its totient is φ = 209436022.

The previous prime is 209436001. The next prime is 209436061. The reversal of 209436023 is 320634902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 209436023 - 2¹⁸ = 209173879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209436223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104718011 + 104718012.

It is an arithmetic number, because the mean of its divisors is an integer number (104718012).

Almost surely, 2^209436023 is an apocalyptic number.

209436023 is a deficient number, since it is larger than the sum of its proper divisors (1).

209436023 is an equidigital number, since it uses as much as digits as its factorization.

209436023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 29.

The square root of 209436023 is about 14471.9046085856. The cubic root of 209436023 is about 593.8596173901.

The spelling of 209436023 in words is "two hundred nine million, four hundred thirty-six thousand, twenty-three".