1242626543 has 16 divisors (see below), whose sum is σ = 1445195520. Its totient is φ = 1059797376.

The previous prime is 1242626531. The next prime is 1242626549. The reversal of 1242626543 is 3456262421.

It is a cyclic number.

It is not a de Polignac number, because 1242626543 - 2¹⁶ = 1242561007 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 (1242626549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76205 + ... + 91062.

It is an arithmetic number, because the mean of its divisors is an integer number (90324720).

Almost surely, 2^1242626543 is an apocalyptic number.

1242626543 is a deficient number, since it is larger than the sum of its proper divisors (202568977).

1242626543 is a wasteful number, since it uses less digits than its factorization.

1242626543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167326.

The product of its digits is 69120, while the sum is 35.

The square root of 1242626543 is about 35250.9083996427. The cubic root of 1242626543 is about 1075.0950824137.

Adding to 1242626543 its reverse (3456262421), we get a palindrome (4698888964).

The spelling of 1242626543 in words is "one billion, two hundred forty-two million, six hundred twenty-six thousand, five hundred forty-three".