11786921 has 4 divisors (see below), whose sum is σ = 11797392. Its totient is φ = 11776452.

The previous prime is 11786911. The next prime is 11786927. The reversal of 11786921 is 12968711.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 11786921 - 2⁶ = 11786857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11786927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3311 + ... + 5876.

It is an arithmetic number, because the mean of its divisors is an integer number (2949348).

Almost surely, 2^11786921 is an apocalyptic number.

It is an amenable number.

11786921 is a deficient number, since it is larger than the sum of its proper divisors (10471).

11786921 is an equidigital number, since it uses as much as digits as its factorization.

11786921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10470.

The product of its digits is 6048, while the sum is 35.

The square root of 11786921 is about 3433.2085576032. The cubic root of 11786921 is about 227.5796669825.

The spelling of 11786921 in words is "eleven million, seven hundred eighty-six thousand, nine hundred twenty-one".