209938 has 8 divisors (see below), whose sum is σ = 323532. Its totient is φ = 102096.

The previous prime is 209929. The next prime is 209939. The reversal of 209938 is 839902.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 208849 + 1089 = 457^2 + 33^2 .

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

It is not an unprimeable number, because it can be changed into a prime (209939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1345 + ... + 1492.

2²⁰⁹⁹³⁸ is an apocalyptic number.

209938 is a deficient number, since it is larger than the sum of its proper divisors (113594).

209938 is a wasteful number, since it uses less digits than its factorization.

209938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2876.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 209938 is about 458.1899169558. The cubic root of 209938 is about 59.4333693779.

The spelling of 209938 in words is "two hundred nine thousand, nine hundred thirty-eight".