18680005 has 12 divisors (see below), whose sum is σ = 23046660. Its totient is φ = 14534784.

The previous prime is 18680003. The next prime is 18680027. The reversal of 18680005 is 50008681.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 7403841 + 11276164 = 2721^2 + 3358^2 .

It is not a de Polignac number, because 18680005 - 2¹ = 18680003 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18680003) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5481 + ... + 8209.

It is an arithmetic number, because the mean of its divisors is an integer number (1920555).

Almost surely, 2^18680005 is an apocalyptic number.

It is an amenable number.

18680005 is a deficient number, since it is larger than the sum of its proper divisors (4366655).

18680005 is an equidigital number, since it uses as much as digits as its factorization.

18680005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2808 (or 2771 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 18680005 is about 4322.0371354258. The cubic root of 18680005 is about 265.3336488062. Note that the first 3 decimals are identical.

Adding to 18680005 its reverse (50008681), we get a palindrome (68688686).

The spelling of 18680005 in words is "eighteen million, six hundred eighty thousand, five".