18389807 has 2 divisors, whose sum is σ = 18389808. Its totient is φ = 18389806.

The previous prime is 18389783. The next prime is 18389809. The reversal of 18389807 is 70898381.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18389807 - 2⁶ = 18389743 is a prime.

Together with 18389809, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18389809) 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, 9194903 + 9194904.

It is an arithmetic number, because the mean of its divisors is an integer number (9194904).

Almost surely, 2^18389807 is an apocalyptic number.

18389807 is a deficient number, since it is larger than the sum of its proper divisors (1).

18389807 is an equidigital number, since it uses as much as digits as its factorization.

18389807 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96768, while the sum is 44.

The square root of 18389807 is about 4288.3338256251. Note that the first 3 decimals coincide. The cubic root of 18389807 is about 263.9524659980.

The spelling of 18389807 in words is "eighteen million, three hundred eighty-nine thousand, eight hundred seven".