13904005 has 4 divisors (see below), whose sum is σ = 16684812. Its totient is φ = 11123200.

The previous prime is 13904003. The next prime is 13904017. The reversal of 13904005 is 50040931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50040931 = 5113 ⋅9787.

It can be written as a sum of positive squares in 2 ways, for example, as 6796449 + 7107556 = 2607^2 + 2666^2 .

It is not a de Polignac number, because 13904005 - 2¹ = 13904003 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13904003) 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, 1390396 + ... + 1390405.

It is an arithmetic number, because the mean of its divisors is an integer number (4171203).

Almost surely, 2^13904005 is an apocalyptic number.

It is an amenable number.

13904005 is a deficient number, since it is larger than the sum of its proper divisors (2780807).

13904005 is an equidigital number, since it uses as much as digits as its factorization.

13904005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2780806.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 13904005 is about 3728.8074501106. The cubic root of 13904005 is about 240.4621015860.

Adding to 13904005 its reverse (50040931), we get a palindrome (63944936).

The spelling of 13904005 in words is "thirteen million, nine hundred four thousand, five".