209939938 has 16 divisors (see below), whose sum is σ = 339438456. Its totient is φ = 96808320.

The previous prime is 209939921. The next prime is 209940041. The reversal of 209939938 is 839939902.

209939938 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 209004849 + 935089 = 14457^2 + 967^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32758 + ... + 38638.

Almost surely, 2^209939938 is an apocalyptic number.

209939938 is a deficient number, since it is larger than the sum of its proper divisors (129498518).

209939938 is a wasteful number, since it uses less digits than its factorization.

209939938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7269.

The product of its (nonzero) digits is 944784, while the sum is 52.

The square root of 209939938 is about 14489.3042621100. The cubic root of 209939938 is about 594.3355225968.

The spelling of 209939938 in words is "two hundred nine million, nine hundred thirty-nine thousand, nine hundred thirty-eight".