11997909 has 64 divisors (see below), whose sum is σ = 23040000. Its totient is φ = 5987520.

The previous prime is 11997901. The next prime is 11997913. The reversal of 11997909 is 90979911.

It is not a de Polignac number, because 11997909 - 2³ = 11997901 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11997901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 60192 + ... + 60390.

It is an arithmetic number, because the mean of its divisors is an integer number (360000).

Almost surely, 2^11997909 is an apocalyptic number.

It is an amenable number.

11997909 is a deficient number, since it is larger than the sum of its proper divisors (11042091).

11997909 is a wasteful number, since it uses less digits than its factorization.

11997909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255 (or 249 counting only the distinct ones).

The product of its (nonzero) digits is 45927, while the sum is 45.

The square root of 11997909 is about 3463.7997921358. The cubic root of 11997909 is about 228.9295499744.

The spelling of 11997909 in words is "eleven million, nine hundred ninety-seven thousand, nine hundred nine".