209870039 has 2 divisors, whose sum is σ = 209870040. Its totient is φ = 209870038.

The previous prime is 209869997. The next prime is 209870081. The reversal of 209870039 is 930078902.

209870039 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (209869997) and next prime (209870081).

It is a cyclic number.

It is not a de Polignac number, because 209870039 - 2²⁰ = 208821463 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 209869984 and 209870011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209870539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104935019 + 104935020.

It is an arithmetic number, because the mean of its divisors is an integer number (104935020).

Almost surely, 2^209870039 is an apocalyptic number.

209870039 is a deficient number, since it is larger than the sum of its proper divisors (1).

209870039 is an equidigital number, since it uses as much as digits as its factorization.

209870039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 209870039 is about 14486.8919717102. The cubic root of 209870039 is about 594.2695544115.

The spelling of 209870039 in words is "two hundred nine million, eight hundred seventy thousand, thirty-nine".