18807 has 4 divisors (see below), whose sum is σ = 25080. Its totient is φ = 12536.

The previous prime is 18803. The next prime is 18839. The reversal of 18807 is 70881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70881 = 3 ⋅23627.

It is a cyclic number.

It is not a de Polignac number, because 18807 - 2² = 18803 is a prime.

It is a D-number.

It is the 35-th Perrin number.

It is a plaindrome in base 8 and base 15.

It is a nialpdrome in base 12.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 18807.

It is not an unprimeable number, because it can be changed into a prime (18803) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3132 + ... + 3137.

It is an arithmetic number, because the mean of its divisors is an integer number (6270).

2¹⁸⁸⁰⁷ is an apocalyptic number.

18807 is a deficient number, since it is larger than the sum of its proper divisors (6273).

18807 is an equidigital number, since it uses as much as digits as its factorization.

18807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6272.

The product of its (nonzero) digits is 448, while the sum is 24.

The square root of 18807 is about 137.1386160059. The cubic root of 18807 is about 26.5933576797.

The spelling of 18807 in words is "eighteen thousand, eight hundred seven".