13890516817 has 4 divisors (see below), whose sum is σ = 14186059776. Its totient is φ = 13594973860.

The previous prime is 13890516811. The next prime is 13890516839. The reversal of 13890516817 is 71861509831.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13890516817 is a prime.

It is a super-2 number, since 2×13890516817² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13890516811) 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, 147771409 + ... + 147771502.

It is an arithmetic number, because the mean of its divisors is an integer number (3546514944).

Almost surely, 2^13890516817 is an apocalyptic number.

It is an amenable number.

13890516817 is a deficient number, since it is larger than the sum of its proper divisors (295542959).

13890516817 is an equidigital number, since it uses as much as digits as its factorization.

13890516817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295542958.

The product of its (nonzero) digits is 362880, while the sum is 49.

The spelling of 13890516817 in words is "thirteen billion, eight hundred ninety million, five hundred sixteen thousand, eight hundred seventeen".