18328969 has 2 divisors, whose sum is σ = 18328970. Its totient is φ = 18328968.

The previous prime is 18328951. The next prime is 18328979. The reversal of 18328969 is 96982381.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14348944 + 3980025 = 3788^2 + 1995^2 .

It is an emirp because it is prime and its reverse (96982381) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18328969 - 2¹³ = 18320777 is a prime.

It is a super-2 number, since 2×18328969² = 671902209205922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18328979) 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, 9164484 + 9164485.

It is an arithmetic number, because the mean of its divisors is an integer number (9164485).

Almost surely, 2^18328969 is an apocalyptic number.

It is an amenable number.

18328969 is a deficient number, since it is larger than the sum of its proper divisors (1).

18328969 is an equidigital number, since it uses as much as digits as its factorization.

18328969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 186624, while the sum is 46.

The square root of 18328969 is about 4281.2345182202. The cubic root of 18328969 is about 263.6610712224.

It can be divided in two parts, 1832 and 8969, that added together give a palindrome (10801).

The spelling of 18328969 in words is "eighteen million, three hundred twenty-eight thousand, nine hundred sixty-nine".