11659921 has 16 divisors (see below), whose sum is σ = 14742784. Its totient is φ = 8973504.

The previous prime is 11659903. The next prime is 11659927. The reversal of 11659921 is 12995611.

It is a happy number.

11659921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 11659921 - 2⁷ = 11659793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11659927) 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, 1636 + ... + 5098.

It is an arithmetic number, because the mean of its divisors is an integer number (921424).

Almost surely, 2^11659921 is an apocalyptic number.

It is an amenable number.

11659921 is a deficient number, since it is larger than the sum of its proper divisors (3082863).

11659921 is a wasteful number, since it uses less digits than its factorization.

11659921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3520.

The product of its digits is 4860, while the sum is 34.

The square root of 11659921 is about 3414.6626480518. The cubic root of 11659921 is about 226.7593495924.

The spelling of 11659921 in words is "eleven million, six hundred fifty-nine thousand, nine hundred twenty-one".