18328693 has 2 divisors, whose sum is σ = 18328694. Its totient is φ = 18328692.

The previous prime is 18328691. The next prime is 18328729. The reversal of 18328693 is 39682381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11135569 + 7193124 = 3337^2 + 2682^2 .

It is an emirp because it is prime and its reverse (39682381) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18328693 - 2¹ = 18328691 is a prime.

Together with 18328691, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18328691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9164346 + 9164347.

It is an arithmetic number, because the mean of its divisors is an integer number (9164347).

Almost surely, 2^18328693 is an apocalyptic number.

It is an amenable number.

18328693 is a deficient number, since it is larger than the sum of its proper divisors (1).

18328693 is an equidigital number, since it uses as much as digits as its factorization.

18328693 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 40.

The square root of 18328693 is about 4281.2022844056. The cubic root of 18328693 is about 263.6597478015.

The spelling of 18328693 in words is "eighteen million, three hundred twenty-eight thousand, six hundred ninety-three".