1340543 has 4 divisors (see below), whose sum is σ = 1344288. Its totient is φ = 1336800.

The previous prime is 1340527. The next prime is 1340557. The reversal of 1340543 is 3450431.

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

It is a cyclic number.

It is not a de Polignac number, because 1340543 - 2⁴ = 1340527 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 (1340243) 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, 1271 + ... + 2072.

It is an arithmetic number, because the mean of its divisors is an integer number (336072).

2^1340543 is an apocalyptic number.

1340543 is a deficient number, since it is larger than the sum of its proper divisors (3745).

1340543 is an equidigital number, since it uses as much as digits as its factorization.

1340543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3744.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 1340543 is about 1157.8182068011. The cubic root of 1340543 is about 110.2622667573.

Adding to 1340543 its reverse (3450431), we get a palindrome (4790974).

The spelling of 1340543 in words is "one million, three hundred forty thousand, five hundred forty-three".