209065340 has 48 divisors (see below), whose sum is σ = 479969280. Its totient is φ = 75862080.

The previous prime is 209065319. The next prime is 209065343. The reversal of 209065340 is 43560902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209065343) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 162821 + ... + 164099.

It is an arithmetic number, because the mean of its divisors is an integer number (9999360).

Almost surely, 2^209065340 is an apocalyptic number.

209065340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

209065340 is an abundant number, since it is smaller than the sum of its proper divisors (270903940).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

209065340 is a wasteful number, since it uses less digits than its factorization.

209065340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2042 (or 2040 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 209065340 is about 14459.0919493584. The cubic root of 209065340 is about 593.5090510429.

The spelling of 209065340 in words is "two hundred nine million, sixty-five thousand, three hundred forty".