13605818 has 4 divisors (see below), whose sum is σ = 20408730. Its totient is φ = 6802908.

The previous prime is 13605817. The next prime is 13605821. The reversal of 13605818 is 81850631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81850631 = 17 ⋅4814743.

It can be written as a sum of positive squares in only one way, i.e., 13053769 + 552049 = 3613^2 + 743^2 .

It is not an unprimeable number, because it can be changed into a prime (13605817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3401453 + ... + 3401456.

Almost surely, 2^13605818 is an apocalyptic number.

13605818 is a deficient number, since it is larger than the sum of its proper divisors (6802912).

13605818 is an equidigital number, since it uses as much as digits as its factorization.

13605818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6802911.

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 13605818 is about 3688.6065119500. The cubic root of 13605818 is about 238.7306712055.

The spelling of 13605818 in words is "thirteen million, six hundred five thousand, eight hundred eighteen".