209038240 has 24 divisors (see below), whose sum is σ = 493853220. Its totient is φ = 83615232.

The previous prime is 209038223. The next prime is 209038241. The reversal of 209038240 is 42830902.

209038240 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 196336144 + 12702096 = 14012^2 + 3564^2 .

It is a junction number, because it is equal to n+sod(n) for n = 209038199 and 209038208.

It is not an unprimeable number, because it can be changed into a prime (209038241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 653085 + ... + 653404.

Almost surely, 2^209038240 is an apocalyptic number.

209038240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

209038240 is an abundant number, since it is smaller than the sum of its proper divisors (284814980).

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

209038240 is a wasteful number, since it uses less digits than its factorization.

209038240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1306504 (or 1306496 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 209038240 is about 14458.1547923654. The cubic root of 209038240 is about 593.4834054875.

The spelling of 209038240 in words is "two hundred nine million, thirty-eight thousand, two hundred forty".