11988621 has 16 divisors (see below), whose sum is σ = 18806400. Its totient is φ = 7521984.

The previous prime is 11988617. The next prime is 11988631. The reversal of 11988621 is 12688911.

It is not a de Polignac number, because 11988621 - 2² = 11988617 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11988631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12601 + ... + 13518.

It is an arithmetic number, because the mean of its divisors is an integer number (1175400).

Almost surely, 2^11988621 is an apocalyptic number.

It is an amenable number.

11988621 is a deficient number, since it is larger than the sum of its proper divisors (6817779).

11988621 is a wasteful number, since it uses less digits than its factorization.

11988621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26145 (or 26139 counting only the distinct ones).

The product of its digits is 6912, while the sum is 36.

The square root of 11988621 is about 3462.4588084192. The cubic root of 11988621 is about 228.8704606065.

The spelling of 11988621 in words is "eleven million, nine hundred eighty-eight thousand, six hundred twenty-one".