18133807 has 4 divisors (see below), whose sum is σ = 18158040. Its totient is φ = 18109576.

The previous prime is 18133793. The next prime is 18133813. The reversal of 18133807 is 70833181.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18133807 - 2¹¹ = 18131759 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 (18133877) 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 3 ways as a sum of consecutive naturals, for example, 10957 + ... + 12502.

It is an arithmetic number, because the mean of its divisors is an integer number (4539510).

Almost surely, 2^18133807 is an apocalyptic number.

18133807 is a deficient number, since it is larger than the sum of its proper divisors (24233).

18133807 is an equidigital number, since it uses as much as digits as its factorization.

18133807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24232.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 18133807 is about 4258.3807955607. The cubic root of 18133807 is about 262.7219323432.

Adding to 18133807 its reverse (70833181), we get a palindrome (88966988).

The spelling of 18133807 in words is "eighteen million, one hundred thirty-three thousand, eight hundred seven".