18907 has 8 divisors (see below), whose sum is σ = 22496. Its totient is φ = 15552.

The previous prime is 18899. The next prime is 18911. The reversal of 18907 is 70981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a 6-Lehmer number, since φ(18907) divides (18907-1)⁶.

It is a cyclic number.

It is not a de Polignac number, because 18907 - 2³ = 18899 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is the 138-th Hogben number.

It is a zygodrome in base 6.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18917) by changing a digit.

It is a nontrivial repunit in base 137.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 223 + ... + 295.

It is an arithmetic number, because the mean of its divisors is an integer number (2812).

2¹⁸⁹⁰⁷ is an apocalyptic number.

18907 is a deficient number, since it is larger than the sum of its proper divisors (3589).

18907 is an equidigital number, since it uses as much as digits as its factorization.

18907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117.

The product of its (nonzero) digits is 504, while the sum is 25.

The square root of 18907 is about 137.5027272457. The cubic root of 18907 is about 26.6404081797.

The spelling of 18907 in words is "eighteen thousand, nine hundred seven".