1243378275839 has 4 divisors (see below), whose sum is σ = 1421003743824. Its totient is φ = 1065752807856.

The previous prime is 1243378275791. The next prime is 1243378275889. The reversal of 1243378275839 is 9385728733421.

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

It is a cyclic number.

It is not a de Polignac number, because 1243378275839 - 2¹² = 1243378271743 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243378275889) 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, 88812733982 + ... + 88812733995.

It is an arithmetic number, because the mean of its divisors is an integer number (355250935956).

Almost surely, 2^{1243378275839} is an apocalyptic number.

1243378275839 is a deficient number, since it is larger than the sum of its proper divisors (177625467985).

1243378275839 is an equidigital number, since it uses as much as digits as its factorization.

1243378275839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177625467984.

The product of its digits is 60963840, while the sum is 62.

The spelling of 1243378275839 in words is "one trillion, two hundred forty-three billion, three hundred seventy-eight million, two hundred seventy-five thousand, eight hundred thirty-nine".