1243243455039 has 24 divisors (see below), whose sum is σ = 1814796219600. Its totient is φ = 820070726400.

The previous prime is 1243243455019. The next prime is 1243243455061. The reversal of 1243243455039 is 9305543423421.

1243243455039 is a `hidden beast` number, since 1 + 2 + 4 + 32 + 4 + 34 + 550 + 39 = 666.

It is not a de Polignac number, because 1243243455039 - 2¹⁵ = 1243243422271 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1243243454985 and 1243243455003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243243455019) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 894232 + ... + 1812770.

It is an arithmetic number, because the mean of its divisors is an integer number (75616509150).

Almost surely, 2^{1243243455039} is an apocalyptic number.

1243243455039 is a deficient number, since it is larger than the sum of its proper divisors (571552764561).

1243243455039 is a wasteful number, since it uses less digits than its factorization.

1243243455039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 920135 (or 920132 counting only the distinct ones).

The product of its (nonzero) digits is 1555200, while the sum is 45.

The spelling of 1243243455039 in words is "one trillion, two hundred forty-three billion, two hundred forty-three million, four hundred fifty-five thousand, thirty-nine".