209000039 has 2 divisors, whose sum is σ = 209000040. Its totient is φ = 209000038.

The previous prime is 209000017. The next prime is 209000063. The reversal of 209000039 is 930000902.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-209000039 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 208999978 and 209000023.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209000069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104500019 + 104500020.

It is an arithmetic number, because the mean of its divisors is an integer number (104500020).

Almost surely, 2^209000039 is an apocalyptic number.

209000039 is a deficient number, since it is larger than the sum of its proper divisors (1).

209000039 is an equidigital number, since it uses as much as digits as its factorization.

209000039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 486, while the sum is 23.

The square root of 209000039 is about 14456.8336436441. The cubic root of 209000039 is about 593.4472509530.

The spelling of 209000039 in words is "two hundred nine million, thirty-nine", and thus it is an aban number.