1242953543 has 16 divisors (see below), whose sum is σ = 1422163680. Its totient is φ = 1077826176.

The previous prime is 1242953539. The next prime is 1242953561. The reversal of 1242953543 is 3453592421.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1242953543 - 2² = 1242953539 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1242953497 and 1242953506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1242953843) 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, 30605 + ... + 58502.

It is an arithmetic number, because the mean of its divisors is an integer number (88885230).

Almost surely, 2^1242953543 is an apocalyptic number.

1242953543 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1242953543 is a deficient number, since it is larger than the sum of its proper divisors (179210137).

1242953543 is a wasteful number, since it uses less digits than its factorization.

1242953543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89186.

The product of its digits is 129600, while the sum is 38.

The square root of 1242953543 is about 35255.5462728916. The cubic root of 1242953543 is about 1075.1893787145.

The spelling of 1242953543 in words is "one billion, two hundred forty-two million, nine hundred fifty-three thousand, five hundred forty-three".