11660391 has 12 divisors (see below), whose sum is σ = 16879720. Its totient is φ = 7756560.

The previous prime is 11660381. The next prime is 11660393. The reversal of 11660391 is 19306611.

11660391 is nontrivially palindromic in base 13.

It is not a de Polignac number, because 11660391 - 2⁷ = 11660263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11660393) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4005 + ... + 6273.

Almost surely, 2^11660391 is an apocalyptic number.

11660391 is a deficient number, since it is larger than the sum of its proper divisors (5219329).

11660391 is a wasteful number, since it uses less digits than its factorization.

11660391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2846 (or 2843 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 11660391 is about 3414.7314682124. The cubic root of 11660391 is about 226.7623963673.

The spelling of 11660391 in words is "eleven million, six hundred sixty thousand, three hundred ninety-one".