11543887 has 4 divisors (see below), whose sum is σ = 12151480. Its totient is φ = 10936296.

The previous prime is 11543879. The next prime is 11543893. The reversal of 11543887 is 78834511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78834511 = 7 ⋅11262073.

It is a cyclic number.

It is not a de Polignac number, because 11543887 - 2³ = 11543879 is a prime.

It is a super-2 number, since 2×11543887² = 266522654137538, 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 (11523887) 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 3 ways as a sum of consecutive naturals, for example, 303768 + ... + 303805.

It is an arithmetic number, because the mean of its divisors is an integer number (3037870).

Almost surely, 2^11543887 is an apocalyptic number.

11543887 is a deficient number, since it is larger than the sum of its proper divisors (607593).

11543887 is an equidigital number, since it uses as much as digits as its factorization.

11543887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 607592.

The product of its digits is 26880, while the sum is 37.

The square root of 11543887 is about 3397.6296148933. The cubic root of 11543887 is about 226.0046400488.

It can be divided in two parts, 1154 and 3887, that added together give a square (5041 = 71²).

The spelling of 11543887 in words is "eleven million, five hundred forty-three thousand, eight hundred eighty-seven".