201618 has 24 divisors (see below), whose sum is σ = 456768. Its totient is φ = 64152.

The previous prime is 201611. The next prime is 201623. The reversal of 201618 is 816102.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a self number, because there is not a number n which added to its sum of digits gives 201618.

It is not an unprimeable number, because it can be changed into a prime (201611) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 171 + ... + 657.

It is an arithmetic number, because the mean of its divisors is an integer number (19032).

2²⁰¹⁶¹⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 201618, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (228384).

201618 is an abundant number, since it is smaller than the sum of its proper divisors (255150).

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

201618 is a wasteful number, since it uses less digits than its factorization.

201618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 518 (or 515 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 201618 is about 449.0189305586. The cubic root of 201618 is about 58.6376334189.

The spelling of 201618 in words is "two hundred one thousand, six hundred eighteen".