18138807 has 6 divisors (see below), whose sum is σ = 26200512. Its totient is φ = 12092532.

The previous prime is 18138797. The next prime is 18138829. The reversal of 18138807 is 70883181.

It is not a de Polignac number, because 18138807 - 2⁸ = 18138551 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18138707) 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 in 5 ways as a sum of consecutive naturals, for example, 1007703 + ... + 1007720.

It is an arithmetic number, because the mean of its divisors is an integer number (4366752).

Almost surely, 2^18138807 is an apocalyptic number.

18138807 is a deficient number, since it is larger than the sum of its proper divisors (8061705).

18138807 is a wasteful number, since it uses less digits than its factorization.

18138807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2015429 (or 2015426 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 36.

The square root of 18138807 is about 4258.9678327031. The cubic root of 18138807 is about 262.7460767299.

The spelling of 18138807 in words is "eighteen million, one hundred thirty-eight thousand, eight hundred seven".