209226240 has 200 divisors, whose sum is σ = 750124980. Its totient is φ = 55738368.

The previous prime is 209226217. The next prime is 209226253. The reversal of 209226240 is 42622902.

It can be written as a sum of positive squares in 2 ways, for example, as 203233536 + 5992704 = 14256^2 + 2448^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 206856 + ... + 207864.

Almost surely, 2^209226240 is an apocalyptic number.

209226240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 209226240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (375062490).

209226240 is an abundant number, since it is smaller than the sum of its proper divisors (540898740).

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

209226240 is an equidigital number, since it uses as much as digits as its factorization.

209226240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1044 (or 1019 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 209226240 is about 14464.6548524325. The cubic root of 209226240 is about 593.6612699911.

The spelling of 209226240 in words is "two hundred nine million, two hundred twenty-six thousand, two hundred forty".