209901238 has 8 divisors (see below), whose sum is σ = 316023120. Its totient is φ = 104560200.

The previous prime is 209901199. The next prime is 209901239. The reversal of 209901238 is 832109902.

209901238 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209901239) 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, 194538 + ... + 195613.

It is an arithmetic number, because the mean of its divisors is an integer number (39502890).

Almost surely, 2^209901238 is an apocalyptic number.

209901238 is a deficient number, since it is larger than the sum of its proper divisors (106121882).

209901238 is a wasteful number, since it uses less digits than its factorization.

209901238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390422.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 209901238 is about 14487.9687327106. The cubic root of 209901238 is about 594.2990007255.

The spelling of 209901238 in words is "two hundred nine million, nine hundred one thousand, two hundred thirty-eight".