18628297 has 2 divisors, whose sum is σ = 18628298. Its totient is φ = 18628296.

The previous prime is 18628289. The next prime is 18628307. The reversal of 18628297 is 79282681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18627856 + 441 = 4316^2 + 21^2 .

It is a cyclic number.

It is not a de Polignac number, because 18628297 - 2³ = 18628289 is a prime.

It is not a weakly prime, because it can be changed into another prime (18628217) 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, 9314148 + 9314149.

It is an arithmetic number, because the mean of its divisors is an integer number (9314149).

Almost surely, 2^18628297 is an apocalyptic number.

It is an amenable number.

18628297 is a deficient number, since it is larger than the sum of its proper divisors (1).

18628297 is an equidigital number, since it uses as much as digits as its factorization.

18628297 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96768, while the sum is 43.

The square root of 18628297 is about 4316.0510886689. The cubic root of 18628297 is about 265.0885997798.

The spelling of 18628297 in words is "eighteen million, six hundred twenty-eight thousand, two hundred ninety-seven".