18800001 has 24 divisors (see below), whose sum is σ = 30191616. Its totient is φ = 11175840.

The previous prime is 18799997. The next prime is 18800003. The reversal of 18800001 is 10000881.

It is a happy number.

It is not a de Polignac number, because 18800001 - 2² = 18799997 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18800003) 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 23 ways as a sum of consecutive naturals, for example, 3456 + ... + 7038.

It is an arithmetic number, because the mean of its divisors is an integer number (1257984).

Almost surely, 2^18800001 is an apocalyptic number.

18800001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18800001 is a deficient number, since it is larger than the sum of its proper divisors (11391615).

18800001 is a wasteful number, since it uses less digits than its factorization.

18800001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3653 (or 3650 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

The square root of 18800001 is about 4335.8967930522. The cubic root of 18800001 is about 265.9005837615.

Adding to 18800001 its reverse (10000881), we get a palindrome (28800882).

The spelling of 18800001 in words is "eighteen million, eight hundred thousand, one".