13944439278 has 128 divisors (see below), whose sum is σ = 40906736640. Its totient is φ = 3408860160.

The previous prime is 13944439247. The next prime is 13944439279. The reversal of 13944439278 is 87293444931.

13944439278 is a `hidden beast` number, since 139 + 4 + 4 + 439 + 2 + 78 = 666.

It is a super-3 number, since 3×13944439278³ (a number of 31 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13944439279) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 27951 + ... + 169322.

It is an arithmetic number, because the mean of its divisors is an integer number (319583880).

Almost surely, 2^13944439278 is an apocalyptic number.

13944439278 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 13944439278, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20453368320).

13944439278 is an abundant number, since it is smaller than the sum of its proper divisors (26962297362).

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

13944439278 is a wasteful number, since it uses less digits than its factorization.

13944439278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197319 (or 197313 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 54.

The spelling of 13944439278 in words is "thirteen billion, nine hundred forty-four million, four hundred thirty-nine thousand, two hundred seventy-eight".