11855143 has 8 divisors (see below), whose sum is σ = 12659328. Its totient is φ = 11075064.

The previous prime is 11855141. The next prime is 11855147. The reversal of 11855143 is 34155811.

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 11855143 - 2¹ = 11855141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11855141) 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, 5005 + ... + 6982.

It is an arithmetic number, because the mean of its divisors is an integer number (1582416).

Almost surely, 2^11855143 is an apocalyptic number.

11855143 is a deficient number, since it is larger than the sum of its proper divisors (804185).

11855143 is a wasteful number, since it uses less digits than its factorization.

11855143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12053.

The product of its digits is 2400, while the sum is 28.

The square root of 11855143 is about 3443.1298261901. The cubic root of 11855143 is about 228.0178951277.

It can be divided in two parts, 1185 and 5143, that added together give a triangular number (6328 = T₁₁₂).

The spelling of 11855143 in words is "eleven million, eight hundred fifty-five thousand, one hundred forty-three".