209639996 has 24 divisors (see below), whose sum is σ = 391628160. Its totient is φ = 97902000.

The previous prime is 209639959. The next prime is 209639999. The reversal of 209639996 is 699936902.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209639999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14030 + ... + 24821.

It is an arithmetic number, because the mean of its divisors is an integer number (16317840).

Almost surely, 2^209639996 is an apocalyptic number.

It is an amenable number.

209639996 is a deficient number, since it is larger than the sum of its proper divisors (181988164).

209639996 is a wasteful number, since it uses less digits than its factorization.

209639996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38945 (or 38943 counting only the distinct ones).

The product of its (nonzero) digits is 1417176, while the sum is 53.

The square root of 209639996 is about 14478.9501000591. The cubic root of 209639996 is about 594.0523445428.

The spelling of 209639996 in words is "two hundred nine million, six hundred thirty-nine thousand, nine hundred ninety-six".