209809232639 has 8 divisors (see below), whose sum is σ = 222269592960. Its totient is φ = 197362054656.

The previous prime is 209809232617. The next prime is 209809232641. The reversal of 209809232639 is 936232908902.

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

It is a cyclic number.

It is not a de Polignac number, because 209809232639 - 2¹² = 209809228543 is a prime.

It is a super-3 number, since 3×209809232639³ (a number of 35 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209809235639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3262799 + ... + 3326480.

It is an arithmetic number, because the mean of its divisors is an integer number (27783699120).

Almost surely, 2^209809232639 is an apocalyptic number.

209809232639 is a deficient number, since it is larger than the sum of its proper divisors (12460360321).

209809232639 is a wasteful number, since it uses less digits than its factorization.

209809232639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6591169.

The product of its (nonzero) digits is 2519424, while the sum is 53.

The spelling of 209809232639 in words is "two hundred nine billion, eight hundred nine million, two hundred thirty-two thousand, six hundred thirty-nine".