1243248905842 has 16 divisors (see below), whose sum is σ = 1950017379840. Its totient is φ = 593355961792.

The previous prime is 1243248905791. The next prime is 1243248905849. The reversal of 1243248905842 is 2485098423421.

It is a self number, because there is not a number n which added to its sum of digits gives 1243248905842.

It is not an unprimeable number, because it can be changed into a prime (1243248905849) 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, 28190023 + ... + 28234090.

It is an arithmetic number, because the mean of its divisors is an integer number (121876086240).

Almost surely, 2^{1243248905842} is an apocalyptic number.

1243248905842 is a deficient number, since it is larger than the sum of its proper divisors (706768473998).

1243248905842 is a wasteful number, since it uses less digits than its factorization.

1243248905842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56424617.

The product of its (nonzero) digits is 4423680, while the sum is 52.

The spelling of 1243248905842 in words is "one trillion, two hundred forty-three billion, two hundred forty-eight million, nine hundred five thousand, eight hundred forty-two".