1393938666489 has 16 divisors (see below), whose sum is σ = 1890477374720. Its totient is φ = 913369167360.

The previous prime is 1393938666473. The next prime is 1393938666551. The reversal of 1393938666489 is 9846668393931.

It is not a de Polignac number, because 1393938666489 - 2⁴ = 1393938666473 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1393938666489.

It is not an unprimeable number, because it can be changed into a prime (1393938666469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2627224 + ... + 3112905.

It is an arithmetic number, because the mean of its divisors is an integer number (118154835920).

Almost surely, 2^{1393938666489} is an apocalyptic number.

It is an amenable number.

1393938666489 is a deficient number, since it is larger than the sum of its proper divisors (496538708231).

1393938666489 is a wasteful number, since it uses less digits than its factorization.

1393938666489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5741520.

The product of its digits is 1088391168, while the sum is 75.

The spelling of 1393938666489 in words is "one trillion, three hundred ninety-three billion, nine hundred thirty-eight million, six hundred sixty-six thousand, four hundred eighty-nine".