13805518 has 4 divisors (see below), whose sum is σ = 20708280. Its totient is φ = 6902758.

The previous prime is 13805507. The next prime is 13805521. The reversal of 13805518 is 81550831.

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

It is a self number, because there is not a number n which added to its sum of digits gives 13805518.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3451378 + ... + 3451381.

It is an arithmetic number, because the mean of its divisors is an integer number (5177070).

Almost surely, 2^13805518 is an apocalyptic number.

13805518 is a deficient number, since it is larger than the sum of its proper divisors (6902762).

13805518 is an equidigital number, since it uses as much as digits as its factorization.

13805518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6902761.

The product of its (nonzero) digits is 4800, while the sum is 31.

The square root of 13805518 is about 3715.5777478072. The cubic root of 13805518 is about 239.8929962811.

The spelling of 13805518 in words is "thirteen million, eight hundred five thousand, five hundred eighteen".