13999281 has 8 divisors (see below), whose sum is σ = 18708384. Its totient is φ = 9311520.

The previous prime is 13999273. The next prime is 13999289. The reversal of 13999281 is 18299931.

It is an interprime number because it is at equal distance from previous prime (13999273) and next prime (13999289).

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

It is not a de Polignac number, because 13999281 - 2³ = 13999273 is a prime.

It is a super-2 number, since 2×13999281² = 391959737033922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13999289) 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, 3735 + ... + 6476.

It is an arithmetic number, because the mean of its divisors is an integer number (2338548).

Almost surely, 2^13999281 is an apocalyptic number.

It is an amenable number.

13999281 is a deficient number, since it is larger than the sum of its proper divisors (4709103).

13999281 is a wasteful number, since it uses less digits than its factorization.

13999281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10671.

The product of its digits is 34992, while the sum is 42.

The square root of 13999281 is about 3741.5613051238. The cubic root of 13999281 is about 241.0101004129.

The spelling of 13999281 in words is "thirteen million, nine hundred ninety-nine thousand, two hundred eighty-one".