1243127842 has 16 divisors (see below), whose sum is σ = 2036664000. Its totient is φ = 564376240.

The previous prime is 1243127777. The next prime is 1243127843. The reversal of 1243127842 is 2487213421.

It is a junction number, because it is equal to n+sod(n) for n = 1243127798 and 1243127807.

It is not an unprimeable number, because it can be changed into a prime (1243127843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15217 + ... + 52132.

It is an arithmetic number, because the mean of its divisors is an integer number (127291500).

Almost surely, 2^1243127842 is an apocalyptic number.

1243127842 is a deficient number, since it is larger than the sum of its proper divisors (793536158).

1243127842 is a wasteful number, since it uses less digits than its factorization.

1243127842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68201.

The product of its digits is 21504, while the sum is 34.

The square root of 1243127842 is about 35258.0181235418. The cubic root of 1243127842 is about 1075.2396341928.

The spelling of 1243127842 in words is "one billion, two hundred forty-three million, one hundred twenty-seven thousand, eight hundred forty-two".