209404306979 has 8 divisors (see below), whose sum is σ = 241514797920. Its totient is φ = 177842713536.

The previous prime is 209404306963. The next prime is 209404306981. The reversal of 209404306979 is 979603404902.

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 209404306979 - 2⁴ = 209404306963 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 209404306979.

It is not an unprimeable number, because it can be changed into a prime (209404306999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 137223554 + ... + 137225079.

It is an arithmetic number, because the mean of its divisors is an integer number (30189349740).

Almost surely, 2^209404306979 is an apocalyptic number.

209404306979 is a deficient number, since it is larger than the sum of its proper divisors (32110490941).

209404306979 is a wasteful number, since it uses less digits than its factorization.

209404306979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274448749.

The product of its (nonzero) digits is 2939328, while the sum is 53.

The spelling of 209404306979 in words is "two hundred nine billion, four hundred four million, three hundred six thousand, nine hundred seventy-nine".