18407 has 4 divisors (see below), whose sum is σ = 18720. Its totient is φ = 18096.

The previous prime is 18401. The next prime is 18413. The reversal of 18407 is 70481.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (18401) and next prime (18413).

It is a cyclic number.

It is not a de Polignac number, because 18407 - 2¹⁰ = 17383 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 (18401) 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, 38 + ... + 195.

It is an arithmetic number, because the mean of its divisors is an integer number (4680).

2¹⁸⁴⁰⁷ is an apocalyptic number.

18407 is a deficient number, since it is larger than the sum of its proper divisors (313).

18407 is an equidigital number, since it uses as much as digits as its factorization.

18407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312.

The product of its (nonzero) digits is 224, while the sum is 20.

The square root of 18407 is about 135.6723995513. The cubic root of 18407 is about 26.4034698531.

Adding to 18407 its reverse (70481), we get a palindrome (88888).

It can be divided in two parts, 1840 and 7, that multiplied together give a triangular number (12880 = T₁₆₀).

The spelling of 18407 in words is "eighteen thousand, four hundred seven".