11857871 has 4 divisors (see below), whose sum is σ = 12178392. Its totient is φ = 11537352.

The previous prime is 11857837. The next prime is 11857873. The reversal of 11857871 is 17875811.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11857871 - 2²² = 7663567 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 (11857873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160205 + ... + 160278.

It is an arithmetic number, because the mean of its divisors is an integer number (3044598).

Almost surely, 2^11857871 is an apocalyptic number.

11857871 is a deficient number, since it is larger than the sum of its proper divisors (320521).

11857871 is an equidigital number, since it uses as much as digits as its factorization.

11857871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320520.

The product of its digits is 15680, while the sum is 38.

The square root of 11857871 is about 3443.5259545994. The cubic root of 11857871 is about 228.0353836026.

The spelling of 11857871 in words is "eleven million, eight hundred fifty-seven thousand, eight hundred seventy-one".