11887871 has 4 divisors (see below), whose sum is σ = 11908512. Its totient is φ = 11867232.

The previous prime is 11887793. The next prime is 11887891. The reversal of 11887871 is 17878811.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11887871 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 (11887891) 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, 9431 + ... + 10616.

It is an arithmetic number, because the mean of its divisors is an integer number (2977128).

Almost surely, 2^11887871 is an apocalyptic number.

11887871 is a deficient number, since it is larger than the sum of its proper divisors (20641).

11887871 is an equidigital number, since it uses as much as digits as its factorization.

11887871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20640.

The product of its digits is 25088, while the sum is 41.

The square root of 11887871 is about 3447.8792032204. The cubic root of 11887871 is about 228.2275288420.

The spelling of 11887871 in words is "eleven million, eight hundred eighty-seven thousand, eight hundred seventy-one".