18008633 has 2 divisors, whose sum is σ = 18008634. Its totient is φ = 18008632.

The previous prime is 18008621. The next prime is 18008647. The reversal of 18008633 is 33680081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15077689 + 2930944 = 3883^2 + 1712^2 .

It is an emirp because it is prime and its reverse (33680081) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18008633 - 2⁸ = 18008377 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18008596 and 18008605.

It is not a weakly prime, because it can be changed into another prime (18008663) 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, 9004316 + 9004317.

It is an arithmetic number, because the mean of its divisors is an integer number (9004317).

Almost surely, 2^18008633 is an apocalyptic number.

It is an amenable number.

18008633 is a deficient number, since it is larger than the sum of its proper divisors (1).

18008633 is an equidigital number, since it uses as much as digits as its factorization.

18008633 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 18008633 is about 4243.6579739654. The cubic root of 18008633 is about 262.1160306142.

The spelling of 18008633 in words is "eighteen million, eight thousand, six hundred thirty-three".