1388493853391 has 4 divisors (see below), whose sum is σ = 1470169962432. Its totient is φ = 1306817744352.

The previous prime is 1388493853277. The next prime is 1388493853427. The reversal of 1388493853391 is 1933583948831.

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 1388493853391 - 2²² = 1388489659087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1388493853991) 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, 40838054495 + ... + 40838054528.

It is an arithmetic number, because the mean of its divisors is an integer number (367542490608).

Almost surely, 2^{1388493853391} is an apocalyptic number.

1388493853391 is a deficient number, since it is larger than the sum of its proper divisors (81676109041).

1388493853391 is an equidigital number, since it uses as much as digits as its factorization.

1388493853391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81676109040.

The product of its digits is 67184640, while the sum is 65.

The spelling of 1388493853391 in words is "one trillion, three hundred eighty-eight billion, four hundred ninety-three million, eight hundred fifty-three thousand, three hundred ninety-one".