18389299 has 2 divisors, whose sum is σ = 18389300. Its totient is φ = 18389298.

The previous prime is 18389263. The next prime is 18389303. The reversal of 18389299 is 99298381.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18389299 - 2¹³ = 18381107 is a prime.

It is a super-2 number, since 2×18389299² = 676332635422802, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18389599) 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, 9194649 + 9194650.

It is an arithmetic number, because the mean of its divisors is an integer number (9194650).

Almost surely, 2^18389299 is an apocalyptic number.

18389299 is a deficient number, since it is larger than the sum of its proper divisors (1).

18389299 is an equidigital number, since it uses as much as digits as its factorization.

18389299 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 279936, while the sum is 49.

The square root of 18389299 is about 4288.2745947525. The cubic root of 18389299 is about 263.9500355015.

The spelling of 18389299 in words is "eighteen million, three hundred eighty-nine thousand, two hundred ninety-nine".