18818001 has 20 divisors (see below), whose sum is σ = 28714752. Its totient is φ = 12275928.

The previous prime is 18817993. The next prime is 18818029. The reversal of 18818001 is 10081881.

18818001 is nontrivially palindromic in base 4.

It is not a de Polignac number, because 18818001 - 2³ = 18817993 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (18818081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1336 + ... + 6278.

Almost surely, 2^18818001 is an apocalyptic number.

It is an amenable number.

18818001 is a deficient number, since it is larger than the sum of its proper divisors (9896751).

18818001 is an equidigital number, since it uses as much as digits as its factorization.

18818001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5002 (or 4993 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 27.

The square root of 18818001 is about 4337.9719916108. The cubic root of 18818001 is about 265.9854185762.

Adding to 18818001 its reverse (10081881), we get a palindrome (28899882).

The spelling of 18818001 in words is "eighteen million, eight hundred eighteen thousand, one".