18730001 has 2 divisors, whose sum is σ = 18730002. Its totient is φ = 18730000.

The previous prime is 18729979. The next prime is 18730009. The reversal of 18730001 is 10003781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17648401 + 1081600 = 4201^2 + 1040^2 .

It is a cyclic number.

It is not a de Polignac number, because 18730001 - 2¹⁰ = 18728977 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18730009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9365000 + 9365001.

It is an arithmetic number, because the mean of its divisors is an integer number (9365001).

Almost surely, 2^18730001 is an apocalyptic number.

It is an amenable number.

18730001 is a deficient number, since it is larger than the sum of its proper divisors (1).

18730001 is an equidigital number, since it uses as much as digits as its factorization.

18730001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 18730001 is about 4327.8171172082. The cubic root of 18730001 is about 265.5701548773.

Adding to 18730001 its reverse (10003781), we get a palindrome (28733782).

The spelling of 18730001 in words is "eighteen million, seven hundred thirty thousand, one".