209939012 has 6 divisors (see below), whose sum is σ = 367393278. Its totient is φ = 104969504.

The previous prime is 209939011. The next prime is 209939053. The reversal of 209939012 is 210939902.

209939012 is digitally balanced in base 3, 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 only one way, i.e., 126472516 + 83466496 = 11246^2 + 9136^2 .

It is a super-2 number, since 2×209939012² = 88148777519072288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (209939011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26242373 + ... + 26242380.

It is an arithmetic number, because the mean of its divisors is an integer number (61232213).

Almost surely, 2^209939012 is an apocalyptic number.

It is an amenable number.

209939012 is a deficient number, since it is larger than the sum of its proper divisors (157454266).

209939012 is a wasteful number, since it uses less digits than its factorization.

209939012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52484757 (or 52484755 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 35.

The square root of 209939012 is about 14489.2723074694. The cubic root of 209939012 is about 594.3346487667.

The spelling of 209939012 in words is "two hundred nine million, nine hundred thirty-nine thousand, twelve".