209889023 has 2 divisors, whose sum is σ = 209889024. Its totient is φ = 209889022.

The previous prime is 209889013. The next prime is 209889041. The reversal of 209889023 is 320988902.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 209889023 - 2¹⁶ = 209823487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209889013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104944511 + 104944512.

It is an arithmetic number, because the mean of its divisors is an integer number (104944512).

Almost surely, 2^209889023 is an apocalyptic number.

209889023 is a deficient number, since it is larger than the sum of its proper divisors (1).

209889023 is an equidigital number, since it uses as much as digits as its factorization.

209889023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 209889023 is about 14487.5471698973. The cubic root of 209889023 is about 594.2874722829.

The spelling of 209889023 in words is "two hundred nine million, eight hundred eighty-nine thousand, twenty-three".