13999705 has 4 divisors (see below), whose sum is σ = 16799652. Its totient is φ = 11199760.

The previous prime is 13999703. The next prime is 13999723. The reversal of 13999705 is 50799931.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5285401 + 8714304 = 2299^2 + 2952^2 .

It is not a de Polignac number, because 13999705 - 2¹ = 13999703 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13999703) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1399966 + ... + 1399975.

It is an arithmetic number, because the mean of its divisors is an integer number (4199913).

Almost surely, 2^13999705 is an apocalyptic number.

It is an amenable number.

13999705 is a deficient number, since it is larger than the sum of its proper divisors (2799947).

13999705 is an equidigital number, since it uses as much as digits as its factorization.

13999705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2799946.

The product of its (nonzero) digits is 76545, while the sum is 43.

The square root of 13999705 is about 3741.6179655331. The cubic root of 13999705 is about 241.0125335676.

The spelling of 13999705 in words is "thirteen million, nine hundred ninety-nine thousand, seven hundred five".