18338807 has 4 divisors (see below), whose sum is σ = 18371496. Its totient is φ = 18306120.

The previous prime is 18338783. The next prime is 18338809. The reversal of 18338807 is 70883381.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70883381 = 409 ⋅173309.

It is a cyclic number.

It is not a de Polignac number, because 18338807 - 2¹² = 18334711 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18338809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15488 + ... + 16629.

It is an arithmetic number, because the mean of its divisors is an integer number (4592874).

Almost surely, 2^18338807 is an apocalyptic number.

18338807 is a deficient number, since it is larger than the sum of its proper divisors (32689).

18338807 is an equidigital number, since it uses as much as digits as its factorization.

18338807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32688.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 18338807 is about 4282.3833317441. The cubic root of 18338807 is about 263.7082357895.

The spelling of 18338807 in words is "eighteen million, three hundred thirty-eight thousand, eight hundred seven".