18415 has 8 divisors (see below), whose sum is σ = 23040. Its totient is φ = 14112.

The previous prime is 18413. The next prime is 18427. The reversal of 18415 is 51481.

18415 is nontrivially palindromic in base 11.

18415 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 18415 - 2¹ = 18413 is a prime.

It is a super-2 number, since 2×18415² = 678224450, which contains 22 as substring.

18415 is an undulating number in base 12.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 18392 and 18401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82 + ... + 208.

It is an arithmetic number, because the mean of its divisors is an integer number (2880).

2¹⁸⁴¹⁵ is an apocalyptic number.

18415 is a deficient number, since it is larger than the sum of its proper divisors (4625).

18415 is a wasteful number, since it uses less digits than its factorization.

18415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161.

The product of its digits is 160, while the sum is 19.

The square root of 18415 is about 135.7018791322. The cubic root of 18415 is about 26.4072944337.

Adding to 18415 its reverse (51481), we get a palindrome (69896).

The spelling of 18415 in words is "eighteen thousand, four hundred fifteen".