209373228 has 72 divisors (see below), whose sum is σ = 552923280. Its totient is φ = 68515200.

The previous prime is 209373221. The next prime is 209373251. The reversal of 209373228 is 822373902.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 209373192 and 209373201.

It is not an unprimeable number, because it can be changed into a prime (209373221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 401608 + ... + 402128.

It is an arithmetic number, because the mean of its divisors is an integer number (7679490).

Almost surely, 2^209373228 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 209373228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (276461640).

209373228 is an abundant number, since it is smaller than the sum of its proper divisors (343550052).

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

209373228 is a wasteful number, since it uses less digits than its factorization.

209373228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 656 (or 587 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 209373228 is about 14469.7348973642. The cubic root of 209373228 is about 593.8002593393.

The spelling of 209373228 in words is "two hundred nine million, three hundred seventy-three thousand, two hundred twenty-eight".