13999005 has 24 divisors (see below), whose sum is σ = 24488568. Its totient is φ = 7397376.

The previous prime is 13999003. The next prime is 13999009. The reversal of 13999005 is 50099931.

It can be written as a sum of positive squares in 4 ways, for example, as 887364 + 13111641 = 942^2 + 3621^2 .

It is not a de Polignac number, because 13999005 - 2¹ = 13999003 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13999003) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3709 + ... + 6461.

It is an arithmetic number, because the mean of its divisors is an integer number (1020357).

Almost surely, 2^13999005 is an apocalyptic number.

13999005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

13999005 is a deficient number, since it is larger than the sum of its proper divisors (10489563).

13999005 is a wasteful number, since it uses less digits than its factorization.

13999005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2877 (or 2874 counting only the distinct ones).

The product of its (nonzero) digits is 10935, while the sum is 36.

The square root of 13999005 is about 3741.5244219435. The cubic root of 13999005 is about 241.0085165405.

It can be divided in two parts, 1399 and 9005, that added together give a square (10404 = 102²).

The spelling of 13999005 in words is "thirteen million, nine hundred ninety-nine thousand, five".