1242673543 has 4 divisors (see below), whose sum is σ = 1253670768. Its totient is φ = 1231676320.

The previous prime is 1242673541. The next prime is 1242673567. The reversal of 1242673543 is 3453762421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3453762421 = 31 ⋅111411691.

It is a cyclic number.

It is not a de Polignac number, because 1242673543 - 2¹ = 1242673541 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 (1242673541) 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, 5498443 + ... + 5498668.

It is an arithmetic number, because the mean of its divisors is an integer number (313417692).

Almost surely, 2^1242673543 is an apocalyptic number.

1242673543 is a deficient number, since it is larger than the sum of its proper divisors (10997225).

1242673543 is a wasteful number, since it uses less digits than its factorization.

1242673543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10997224.

The product of its digits is 120960, while the sum is 37.

The square root of 1242673543 is about 35251.5750428261. The cubic root of 1242673543 is about 1075.1086367225.

The spelling of 1242673543 in words is "one billion, two hundred forty-two million, six hundred seventy-three thousand, five hundred forty-three".