13944381 has 8 divisors (see below), whose sum is σ = 20282784. Its totient is φ = 8451120.

The previous prime is 13944379. The next prime is 13944401. The reversal of 13944381 is 18344931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13944381 - 2¹ = 13944379 is a prime.

It is a super-2 number, since 2×13944381² = 388891522946322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 422557 = 13944381 / (1 + 3 + 9 + 4 + 4 + 3 + 8 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13944181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 211246 + ... + 211311.

It is an arithmetic number, because the mean of its divisors is an integer number (2535348).

Almost surely, 2^13944381 is an apocalyptic number.

13944381 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13944381 is a deficient number, since it is larger than the sum of its proper divisors (6338403).

13944381 is a wasteful number, since it uses less digits than its factorization.

13944381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422571.

The product of its digits is 10368, while the sum is 33.

The square root of 13944381 is about 3734.2175887326. The cubic root of 13944381 is about 240.6946368643.

It can be divided in two parts, 1394 and 4381, that added together give a palindrome (5775).

The spelling of 13944381 in words is "thirteen million, nine hundred forty-four thousand, three hundred eighty-one".