15618 has 16 divisors (see below), whose sum is σ = 33120. Its totient is φ = 4896.

The previous prime is 15607. The next prime is 15619. The reversal of 15618 is 81651.

It is a Curzon number.

It is a nialpdrome in base 5.

It is a zygodrome in base 5.

It is a junction number, because it is equal to n+sod(n) for n = 15594 and 15603.

It is not an unprimeable number, because it can be changed into a prime (15619) by changing a digit.

15618 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46 + ... + 182.

It is an arithmetic number, because the mean of its divisors is an integer number (2070).

15618 is a Friedman number, since it can be written as 5^6-8*1+1, using all its digits and the basic arithmetic operations.

2¹⁵⁶¹⁸ is an apocalyptic number.

15618 is an abundant number, since it is smaller than the sum of its proper divisors (17502).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16560).

15618 is a wasteful number, since it uses less digits than its factorization.

15618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161.

The product of its digits is 240, while the sum is 21.

The square root of 15618 is about 124.9719968633. The cubic root of 15618 is about 24.9962661090.

The spelling of 15618 in words is "fifteen thousand, six hundred eighteen".