11969871 has 4 divisors (see below), whose sum is σ = 15959832. Its totient is φ = 7979912.

The previous prime is 11969857. The next prime is 11969879. The reversal of 11969871 is 17896911.

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 11969871 - 2⁶ = 11969807 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11969879) 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, 1994976 + ... + 1994981.

It is an arithmetic number, because the mean of its divisors is an integer number (3989958).

Almost surely, 2^11969871 is an apocalyptic number.

11969871 is a deficient number, since it is larger than the sum of its proper divisors (3989961).

11969871 is an equidigital number, since it uses as much as digits as its factorization.

11969871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3989960.

The product of its digits is 27216, while the sum is 42.

The square root of 11969871 is about 3459.7501354867. The cubic root of 11969871 is about 228.7510818427.

The spelling of 11969871 in words is "eleven million, nine hundred sixty-nine thousand, eight hundred seventy-one".