13939388135401 has 3 divisors (see below), whose sum is σ = 13939391868951. Its totient is φ = 13939384401852.

The previous prime is 13939388135383. The next prime is 13939388135423. The reversal of 13939388135401 is 10453188393931.

The square root of 13939388135401 is 3733549.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 13810521495001 + 128866640400 = 3716251^2 + 358980^2 .

It is not a de Polignac number, because 13939388135401 - 2⁵ = 13939388135369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13939388135471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1866775 + ... + 5600323.

It is an arithmetic number, because the mean of its divisors is an integer number (4646463956317).

Almost surely, 2^{13939388135401} is an apocalyptic number.

13939388135401 is the 3733549-th square number.

13939388135401 is the 1866775-th centered octagonal number.

It is an amenable number.

13939388135401 is a deficient number, since it is larger than the sum of its proper divisors (3733550).

13939388135401 is an frugal number, since it uses more digits than its factorization.

13939388135401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7467098 (or 3733549 counting only the distinct ones).

The product of its (nonzero) digits is 8398080, while the sum is 58.

The spelling of 13939388135401 in words is "thirteen trillion, nine hundred thirty-nine billion, three hundred eighty-eight million, one hundred thirty-five thousand, four hundred one".