209842065 has 12 divisors (see below), whose sum is σ = 363726324. Its totient is φ = 111915744.

The previous prime is 209842063. The next prime is 209842081. The reversal of 209842065 is 560248902.

It is a happy number.

209842065 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 31539456 + 178302609 = 5616^2 + 13353^2 .

It is not a de Polignac number, because 209842065 - 2¹ = 209842063 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (209842063) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2331534 + ... + 2331623.

It is an arithmetic number, because the mean of its divisors is an integer number (30310527).

Almost surely, 2^209842065 is an apocalyptic number.

It is an amenable number.

209842065 is a deficient number, since it is larger than the sum of its proper divisors (153884259).

209842065 is a wasteful number, since it uses less digits than its factorization.

209842065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4663168 (or 4663165 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 209842065 is about 14485.9264460372. The cubic root of 209842065 is about 594.2431494432.

The spelling of 209842065 in words is "two hundred nine million, eight hundred forty-two thousand, sixty-five".