11985975 has 36 divisors (see below), whose sum is σ = 22274616. Its totient is φ = 6389280.

The previous prime is 11985971. The next prime is 11985977. The reversal of 11985975 is 57958911.

11985975 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11985975 - 2² = 11985971 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 11985975.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11985971) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 5089 + ... + 7061.

Almost surely, 2^11985975 is an apocalyptic number.

11985975 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

11985975 is a deficient number, since it is larger than the sum of its proper divisors (10288641).

11985975 is an equidigital number, since it uses as much as digits as its factorization.

11985975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1998 (or 1981 counting only the distinct ones).

The product of its digits is 113400, while the sum is 45.

The square root of 11985975 is about 3462.0766889253. The cubic root of 11985975 is about 228.8536214222.

The spelling of 11985975 in words is "eleven million, nine hundred eighty-five thousand, nine hundred seventy-five".