18700001 has 2 divisors, whose sum is σ = 18700002. Its totient is φ = 18700000.

The previous prime is 18699997. The next prime is 18700007. The reversal of 18700001 is 10000781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18696976 + 3025 = 4324^2 + 55^2 .

It is a cyclic number.

It is not a de Polignac number, because 18700001 - 2² = 18699997 is a prime.

It is not a weakly prime, because it can be changed into another prime (18700007) 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 as a sum of consecutive naturals, namely, 9350000 + 9350001.

It is an arithmetic number, because the mean of its divisors is an integer number (9350001).

Almost surely, 2^18700001 is an apocalyptic number.

It is an amenable number.

18700001 is a deficient number, since it is larger than the sum of its proper divisors (1).

18700001 is an equidigital number, since it uses as much as digits as its factorization.

18700001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56, while the sum is 17.

The square root of 18700001 is about 4324.3497777123. The cubic root of 18700001 is about 265.4282904589.

Adding to 18700001 its reverse (10000781), we get a palindrome (28700782).

The spelling of 18700001 in words is "eighteen million, seven hundred thousand, one".