11979009 has 40 divisors (see below), whose sum is σ = 21040448. Its totient is φ = 6648480.

The previous prime is 11978959. The next prime is 11979029. The reversal of 11979009 is 90097911.

It is not a de Polignac number, because 11979009 - 2¹² = 11974913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11979029) 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, 20694 + ... + 21264.

Almost surely, 2^11979009 is an apocalyptic number.

It is an amenable number.

11979009 is a deficient number, since it is larger than the sum of its proper divisors (9061439).

11979009 is an equidigital number, since it uses as much as digits as its factorization.

11979009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 627 (or 618 counting only the distinct ones).

The product of its (nonzero) digits is 5103, while the sum is 36.

The square root of 11979009 is about 3461.0704991375. The cubic root of 11979009 is about 228.8092778383.

The spelling of 11979009 in words is "eleven million, nine hundred seventy-nine thousand, nine".