1243543 has 8 divisors (see below), whose sum is σ = 1445760. Its totient is φ = 1047480.

The previous prime is 1243537. The next prime is 1243547. The reversal of 1243543 is 3453421.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1243543 - 2⁵ = 1243511 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 (1243547) 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, 1093 + ... + 1918.

It is an arithmetic number, because the mean of its divisors is an integer number (180720).

2^1243543 is an apocalyptic number.

1243543 is a deficient number, since it is larger than the sum of its proper divisors (202217).

1243543 is an equidigital number, since it uses as much as digits as its factorization.

1243543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3077.

The product of its digits is 1440, while the sum is 22.

The square root of 1243543 is about 1115.1425917792. The cubic root of 1243543 is about 107.5359317419.

Adding to 1243543 its reverse (3453421), we get a palindrome (4696964).

The spelling of 1243543 in words is "one million, two hundred forty-three thousand, five hundred forty-three".