18236807 has 2 divisors, whose sum is σ = 18236808. Its totient is φ = 18236806.

The previous prime is 18236791. The next prime is 18236809. The reversal of 18236807 is 70863281.

It is a strong prime.

It is an emirp because it is prime and its reverse (70863281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18236807 - 2⁴ = 18236791 is a prime.

It is a super-2 number, since 2×18236807² = 665162259110498, which contains 22 as substring.

Together with 18236809, 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 (18236809) 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, 9118403 + 9118404.

It is an arithmetic number, because the mean of its divisors is an integer number (9118404).

Almost surely, 2^18236807 is an apocalyptic number.

18236807 is a deficient number, since it is larger than the sum of its proper divisors (1).

18236807 is an equidigital number, since it uses as much as digits as its factorization.

18236807 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 18236807 is about 4270.4574696395. The cubic root of 18236807 is about 263.2184135992.

The spelling of 18236807 in words is "eighteen million, two hundred thirty-six thousand, eight hundred seven".