18628733 has 2 divisors, whose sum is σ = 18628734. Its totient is φ = 18628732.

The previous prime is 18628717. The next prime is 18628763. The reversal of 18628733 is 33782681.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11648569 + 6980164 = 3413^2 + 2642^2 .

It is an emirp because it is prime and its reverse (33782681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18628733 - 2⁴ = 18628717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18628703) 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, 9314366 + 9314367.

It is an arithmetic number, because the mean of its divisors is an integer number (9314367).

Almost surely, 2^18628733 is an apocalyptic number.

It is an amenable number.

18628733 is a deficient number, since it is larger than the sum of its proper divisors (1).

18628733 is an equidigital number, since it uses as much as digits as its factorization.

18628733 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48384, while the sum is 38.

The square root of 18628733 is about 4316.1015975067. The cubic root of 18628733 is about 265.0906679189.

The spelling of 18628733 in words is "eighteen million, six hundred twenty-eight thousand, seven hundred thirty-three".