11543987 has 8 divisors (see below), whose sum is σ = 14208096. Its totient is φ = 9133632.

The previous prime is 11543981. The next prime is 11543993. The reversal of 11543987 is 78934511.

It is an interprime number because it is at equal distance from previous prime (11543981) and next prime (11543993).

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 11543987 - 2⁴ = 11543971 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11543987.

It is not an unprimeable number, because it can be changed into a prime (11543981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63338 + ... + 63519.

It is an arithmetic number, because the mean of its divisors is an integer number (1776012).

Almost surely, 2^11543987 is an apocalyptic number.

11543987 is a deficient number, since it is larger than the sum of its proper divisors (2664109).

11543987 is a wasteful number, since it uses less digits than its factorization.

11543987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126877.

The product of its digits is 30240, while the sum is 38.

The square root of 11543987 is about 3397.6443310035. The cubic root of 11543987 is about 226.0052926424.

It can be divided in two parts, 115 and 43987, that multiplied together give a palindrome (5058505).

The spelling of 11543987 in words is "eleven million, five hundred forty-three thousand, nine hundred eighty-seven".