13938822578 has 18 divisors (see below), whose sum is σ = 21612475197. Its totient is φ = 6742087080.

The previous prime is 13938822577. The next prime is 13938822593. The reversal of 13938822578 is 87522883931.

It can be written as a sum of positive squares in 2 ways, for example, as 13825761889 + 113060689 = 117583^2 + 10633^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=83483.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13938822577) 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 8 ways as a sum of consecutive naturals, for example, 5174600 + ... + 5177292.

Almost surely, 2^13938822578 is an apocalyptic number.

13938822578 is a deficient number, since it is larger than the sum of its proper divisors (7673652619).

13938822578 is an frugal number, since it uses more digits than its factorization.

13938822578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5450 (or 2726 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 56.

The spelling of 13938822578 in words is "thirteen billion, nine hundred thirty-eight million, eight hundred twenty-two thousand, five hundred seventy-eight".