11987993 has 8 divisors (see below), whose sum is σ = 12745920. Its totient is φ = 11242800.

The previous prime is 11987981. The next prime is 11988029. The reversal of 11987993 is 39978911.

It is a happy number.

11987993 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11987993 - 2⁴ = 11987977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11987923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1205 + ... + 5042.

It is an arithmetic number, because the mean of its divisors is an integer number (1593240).

Almost surely, 2^11987993 is an apocalyptic number.

It is an amenable number.

11987993 is a deficient number, since it is larger than the sum of its proper divisors (757927).

11987993 is a wasteful number, since it uses less digits than its factorization.

11987993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6367.

The product of its digits is 122472, while the sum is 47.

The square root of 11987993 is about 3462.3681202322. The cubic root of 11987993 is about 228.8664642292.

The spelling of 11987993 in words is "eleven million, nine hundred eighty-seven thousand, nine hundred ninety-three".