13949399808 has 216 divisors, whose sum is σ = 40985184240. Its totient is φ = 4562288640.

The previous prime is 13949399777. The next prime is 13949399813. The reversal of 13949399808 is 80899394931.

It is a happy number.

13949399808 is a `hidden beast` number, since 139 + 493 + 9 + 9 + 8 + 0 + 8 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34105908 + ... + 34106316.

Almost surely, 2^13949399808 is an apocalyptic number.

13949399808 is a gapful number since it is divisible by the number (18) 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 13949399808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20492592120).

13949399808 is an abundant number, since it is smaller than the sum of its proper divisors (27035784432).

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

13949399808 is a wasteful number, since it uses less digits than its factorization.

13949399808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 675 (or 658 counting only the distinct ones).

The product of its (nonzero) digits is 15116544, while the sum is 63.

The spelling of 13949399808 in words is "thirteen billion, nine hundred forty-nine million, three hundred ninety-nine thousand, eight hundred eight".