13865143 has 4 divisors (see below), whose sum is σ = 13941928. Its totient is φ = 13788360.

The previous prime is 13865101. The next prime is 13865147. The reversal of 13865143 is 34156831.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13865143 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 (13865147) 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 3 ways as a sum of consecutive naturals, for example, 38121 + ... + 38482.

It is an arithmetic number, because the mean of its divisors is an integer number (3485482).

Almost surely, 2^13865143 is an apocalyptic number.

13865143 is a deficient number, since it is larger than the sum of its proper divisors (76785).

13865143 is an equidigital number, since it uses as much as digits as its factorization.

13865143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76784.

The product of its digits is 8640, while the sum is 31.

The square root of 13865143 is about 3723.5927543167. The cubic root of 13865143 is about 240.2378602474.

The spelling of 13865143 in words is "thirteen million, eight hundred sixty-five thousand, one hundred forty-three".