12409579809 has 40 divisors (see below), whose sum is σ = 20450374560. Its totient is φ = 7436404800.

The previous prime is 12409579769. The next prime is 12409579841. The reversal of 12409579809 is 90897590421.

It is not a de Polignac number, because 12409579809 - 2¹² = 12409575713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12409579849) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1054 + ... + 157544.

It is an arithmetic number, because the mean of its divisors is an integer number (511259364).

Almost surely, 2^12409579809 is an apocalyptic number.

It is an amenable number.

12409579809 is a deficient number, since it is larger than the sum of its proper divisors (8040794751).

12409579809 is a wasteful number, since it uses less digits than its factorization.

12409579809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156603 (or 156594 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 54.

The spelling of 12409579809 in words is "twelve billion, four hundred nine million, five hundred seventy-nine thousand, eight hundred nine".