209479338 has 96 divisors (see below), whose sum is σ = 511633920. Its totient is φ = 63452160.

The previous prime is 209479327. The next prime is 209479379. The reversal of 209479338 is 833974902.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 209479293 and 209479302.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 483570 + ... + 484002.

It is an arithmetic number, because the mean of its divisors is an integer number (5329520).

Almost surely, 2^209479338 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 209479338, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (255816960).

209479338 is an abundant number, since it is smaller than the sum of its proper divisors (302154582).

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

209479338 is a wasteful number, since it uses less digits than its factorization.

209479338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 509 (or 486 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The square root of 209479338 is about 14473.4010515842. The cubic root of 209479338 is about 593.9005547224.

The spelling of 209479338 in words is "two hundred nine million, four hundred seventy-nine thousand, three hundred thirty-eight".