1243123142 has 8 divisors (see below), whose sum is σ = 1867998456. Its totient is φ = 620456992.

The previous prime is 1243123103. The next prime is 1243123187. The reversal of 1243123142 is 2413213421.

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

It is a congruent number.

It is an unprimeable number.

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, 550883 + ... + 553134.

It is an arithmetic number, because the mean of its divisors is an integer number (233499807).

Almost surely, 2^1243123142 is an apocalyptic number.

1243123142 is a deficient number, since it is larger than the sum of its proper divisors (624875314).

1243123142 is a wasteful number, since it uses less digits than its factorization.

1243123142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1104582.

The product of its digits is 1152, while the sum is 23.

The square root of 1243123142 is about 35257.9514719730. The cubic root of 1243123142 is about 1075.2382791075.

Adding to 1243123142 its reverse (2413213421), we get a palindrome (3656336563).

The spelling of 1243123142 in words is "one billion, two hundred forty-three million, one hundred twenty-three thousand, one hundred forty-two".