13840543 has 4 divisors (see below), whose sum is σ = 13946328. Its totient is φ = 13734760.

The previous prime is 13840523. The next prime is 13840559. The reversal of 13840543 is 34504831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34504831 = 37 ⋅932563.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13840543 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 (13840523) 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, 52696 + ... + 52957.

It is an arithmetic number, because the mean of its divisors is an integer number (3486582).

Almost surely, 2^13840543 is an apocalyptic number.

13840543 is a deficient number, since it is larger than the sum of its proper divisors (105785).

13840543 is a wasteful number, since it uses less digits than its factorization.

13840543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105784.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 13840543 is about 3720.2880264840. The cubic root of 13840543 is about 240.0956967908.

The spelling of 13840543 in words is "thirteen million, eight hundred forty thousand, five hundred forty-three".