13704640438 has 4 divisors (see below), whose sum is σ = 20556960660. Its totient is φ = 6852320218.

The previous prime is 13704640421. The next prime is 13704640447. The reversal of 13704640438 is 83404640731.

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

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 13704640438.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 3426160108 + ... + 3426160111.

It is an arithmetic number, because the mean of its divisors is an integer number (5139240165).

Almost surely, 2^13704640438 is an apocalyptic number.

13704640438 is a deficient number, since it is larger than the sum of its proper divisors (6852320222).

13704640438 is an equidigital number, since it uses as much as digits as its factorization.

13704640438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6852320221.

The product of its (nonzero) digits is 193536, while the sum is 40.

The spelling of 13704640438 in words is "thirteen billion, seven hundred four million, six hundred forty thousand, four hundred thirty-eight".