13930478991 has 24 divisors (see below), whose sum is σ = 23639602896. Its totient is φ = 7793274240.

The previous prime is 13930478987. The next prime is 13930479001. The reversal of 13930478991 is 19987403931.

It is a happy number.

13930478991 is a `hidden beast` number, since 139 + 30 + 478 + 9 + 9 + 1 = 666.

It is not a de Polignac number, because 13930478991 - 2² = 13930478987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13930478911) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5410710 + ... + 5413283.

It is an arithmetic number, because the mean of its divisors is an integer number (984983454).

Almost surely, 2^13930478991 is an apocalyptic number.

13930478991 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

13930478991 is a deficient number, since it is larger than the sum of its proper divisors (9709123905).

13930478991 is a wasteful number, since it uses less digits than its factorization.

13930478991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10824023 (or 10824020 counting only the distinct ones).

The product of its (nonzero) digits is 1469664, while the sum is 54.

The spelling of 13930478991 in words is "thirteen billion, nine hundred thirty million, four hundred seventy-eight thousand, nine hundred ninety-one".