11985869 has 4 divisors (see below), whose sum is σ = 13698144. Its totient is φ = 10273596.

The previous prime is 11985859. The next prime is 11985877. The reversal of 11985869 is 96858911.

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 a cyclic number.

It is not a de Polignac number, because 11985869 - 2¹² = 11981773 is a prime.

It is a super-2 number, since 2×11985869² = 287322111370322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11985839) 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, 856127 + ... + 856140.

It is an arithmetic number, because the mean of its divisors is an integer number (3424536).

Almost surely, 2^11985869 is an apocalyptic number.

It is an amenable number.

11985869 is a deficient number, since it is larger than the sum of its proper divisors (1712275).

11985869 is an equidigital number, since it uses as much as digits as its factorization.

11985869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1712274.

The product of its digits is 155520, while the sum is 47.

The square root of 11985869 is about 3462.0613801607. The cubic root of 11985869 is about 228.8529467849.

The spelling of 11985869 in words is "eleven million, nine hundred eighty-five thousand, eight hundred sixty-nine".