18628717 has 2 divisors, whose sum is σ = 18628718. Its totient is φ = 18628716.

The previous prime is 18628703. The next prime is 18628733. The reversal of 18628717 is 71782681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13402921 + 5225796 = 3661^2 + 2286^2 .

It is an emirp because it is prime and its reverse (71782681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18628717 - 2¹⁵ = 18595949 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18628717.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18628777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9314358 + 9314359.

It is an arithmetic number, because the mean of its divisors is an integer number (9314359).

Almost surely, 2^18628717 is an apocalyptic number.

It is an amenable number.

18628717 is a deficient number, since it is larger than the sum of its proper divisors (1).

18628717 is an equidigital number, since it uses as much as digits as its factorization.

18628717 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37632, while the sum is 40.

The square root of 18628717 is about 4316.0997439818. The cubic root of 18628717 is about 265.0905920245.

The spelling of 18628717 in words is "eighteen million, six hundred twenty-eight thousand, seven hundred seventeen".