209729106 has 24 divisors (see below), whose sum is σ = 478330320. Its totient is φ = 66230136.

The previous prime is 209729089. The next prime is 209729161. The reversal of 209729106 is 601927902.

209729106 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 306280 + ... + 306963.

It is an arithmetic number, because the mean of its divisors is an integer number (19930430).

Almost surely, 2^209729106 is an apocalyptic number.

209729106 is an abundant number, since it is smaller than the sum of its proper divisors (268601214).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

209729106 is a wasteful number, since it uses less digits than its factorization.

209729106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 613270 (or 613267 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 209729106 is about 14482.0269990081. The cubic root of 209729106 is about 594.1365023161.

The spelling of 209729106 in words is "two hundred nine million, seven hundred twenty-nine thousand, one hundred six".