11786421 has 4 divisors (see below), whose sum is σ = 15715232. Its totient is φ = 7857612.

The previous prime is 11786413. The next prime is 11786431. The reversal of 11786421 is 12468711.

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.

It is not a de Polignac number, because 11786421 - 2³ = 11786413 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 (11786431) 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, 1964401 + ... + 1964406.

It is an arithmetic number, because the mean of its divisors is an integer number (3928808).

Almost surely, 2^11786421 is an apocalyptic number.

It is an amenable number.

11786421 is a deficient number, since it is larger than the sum of its proper divisors (3928811).

11786421 is an equidigital number, since it uses as much as digits as its factorization.

11786421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3928810.

The product of its digits is 2688, while the sum is 30.

The square root of 11786421 is about 3433.1357386506. The cubic root of 11786421 is about 227.5764489681.

The spelling of 11786421 in words is "eleven million, seven hundred eighty-six thousand, four hundred twenty-one".