18805001 has 4 divisors (see below), whose sum is σ = 18836292. Its totient is φ = 18773712.

The previous prime is 18804997. The next prime is 18805013. The reversal of 18805001 is 10050881.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5107600 + 13697401 = 2260^2 + 3701^2 .

It is a cyclic number.

It is not a de Polignac number, because 18805001 - 2² = 18804997 is a prime.

It is a super-2 number, since 2×18805001² = 707256125220002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18805201) 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, 14726 + ... + 15951.

It is an arithmetic number, because the mean of its divisors is an integer number (4709073).

Almost surely, 2^18805001 is an apocalyptic number.

It is an amenable number.

18805001 is a deficient number, since it is larger than the sum of its proper divisors (31291).

18805001 is an equidigital number, since it uses as much as digits as its factorization.

18805001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31290.

The product of its (nonzero) digits is 320, while the sum is 23.

The square root of 18805001 is about 4336.4733367104. The cubic root of 18805001 is about 265.9241544175.

Adding to 18805001 its reverse (10050881), we get a palindrome (28855882).

The spelling of 18805001 in words is "eighteen million, eight hundred five thousand, one".