1239844868405 has 48 divisors (see below), whose sum is σ = 1817975050752. Its totient is φ = 805493462400.

The previous prime is 1239844868393. The next prime is 1239844868477. The reversal of 1239844868405 is 5048684489321.

It is not a de Polignac number, because 1239844868405 - 2⁴ = 1239844868389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2298779 + ... + 2786408.

It is an arithmetic number, because the mean of its divisors is an integer number (37874480224).

Almost surely, 2^{1239844868405} is an apocalyptic number.

It is an amenable number.

1239844868405 is a deficient number, since it is larger than the sum of its proper divisors (578130182347).

1239844868405 is a wasteful number, since it uses less digits than its factorization.

1239844868405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5085258 (or 5085247 counting only the distinct ones).

The product of its (nonzero) digits is 53084160, while the sum is 62.

The spelling of 1239844868405 in words is "one trillion, two hundred thirty-nine billion, eight hundred forty-four million, eight hundred sixty-eight thousand, four hundred five".