209349198 has 80 divisors (see below), whose sum is σ = 492384816. Its totient is φ = 66407040.

The previous prime is 209349193. The next prime is 209349209. The reversal of 209349198 is 891943902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209349193) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 285240 + ... + 285972.

Almost surely, 2^209349198 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 209349198, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (246192408).

209349198 is an abundant number, since it is smaller than the sum of its proper divisors (283035618).

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

209349198 is a wasteful number, since it uses less digits than its factorization.

209349198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 831 (or 822 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 209349198 is about 14468.9045196933. The cubic root of 209349198 is about 593.7775414297. Note that the first 3 decimals are identical.

The spelling of 209349198 in words is "two hundred nine million, three hundred forty-nine thousand, one hundred ninety-eight".