1242120143 has 8 divisors (see below), whose sum is σ = 1360080720. Its totient is φ = 1124999680.

The previous prime is 1242120107. The next prime is 1242120161. The reversal of 1242120143 is 3410212421.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1242120143 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 (1242120163) 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 7 ways as a sum of consecutive naturals, for example, 206930 + ... + 212847.

It is an arithmetic number, because the mean of its divisors is an integer number (170010090).

Almost surely, 2^1242120143 is an apocalyptic number.

1242120143 is a deficient number, since it is larger than the sum of its proper divisors (117960577).

1242120143 is a wasteful number, since it uses less digits than its factorization.

1242120143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420057.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 1242120143 is about 35243.7248740822. The cubic root of 1242120143 is about 1074.9490202614.

Adding to 1242120143 its reverse (3410212421), we get a palindrome (4652332564).

The spelling of 1242120143 in words is "one billion, two hundred forty-two million, one hundred twenty thousand, one hundred forty-three".