13994391840 has 768 divisors, whose sum is σ = 55964805120. Its totient is φ = 2887188480.

The previous prime is 13994391833. The next prime is 13994391913. The reversal of 13994391840 is 4819349931.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 78180871 + ... + 78181049.

It is an arithmetic number, because the mean of its divisors is an integer number (72870840).

Almost surely, 2^13994391840 is an apocalyptic number.

13994391840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13994391840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27982402560).

13994391840 is an abundant number, since it is smaller than the sum of its proper divisors (41970413280).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13994391840 is a wasteful number, since it uses less digits than its factorization.

13994391840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305 (or 297 counting only the distinct ones).

The product of its (nonzero) digits is 839808, while the sum is 51.

The spelling of 13994391840 in words is "thirteen billion, nine hundred ninety-four million, three hundred ninety-one thousand, eight hundred forty".