1242026143 has 4 divisors (see below), whose sum is σ = 1307395960. Its totient is φ = 1176656328.

The previous prime is 1242026117. The next prime is 1242026167. The reversal of 1242026143 is 3416202421.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1242026143 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 (1242326143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32684880 + ... + 32684917.

It is an arithmetic number, because the mean of its divisors is an integer number (326848990).

Almost surely, 2^1242026143 is an apocalyptic number.

1242026143 is a deficient number, since it is larger than the sum of its proper divisors (65369817).

1242026143 is an equidigital number, since it uses as much as digits as its factorization.

1242026143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65369816.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 1242026143 is about 35242.3912781185. The cubic root of 1242026143 is about 1074.9219032503.

Adding to 1242026143 its reverse (3416202421), we get a palindrome (4658228564).

The spelling of 1242026143 in words is "one billion, two hundred forty-two million, twenty-six thousand, one hundred forty-three".