13805639 has 8 divisors (see below), whose sum is σ = 14273280. Its totient is φ = 13345336.

The previous prime is 13805629. The next prime is 13805641. The reversal of 13805639 is 93650831.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13805639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13805599 and 13805608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13805629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2132 + ... + 5670.

It is an arithmetic number, because the mean of its divisors is an integer number (1784160).

Almost surely, 2^13805639 is an apocalyptic number.

13805639 is a deficient number, since it is larger than the sum of its proper divisors (467641).

13805639 is an equidigital number, since it uses as much as digits as its factorization.

13805639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3669.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 13805639 is about 3715.5940305690. The cubic root of 13805639 is about 239.8936971353.

The spelling of 13805639 in words is "thirteen million, eight hundred five thousand, six hundred thirty-nine".