201918 has 16 divisors (see below), whose sum is σ = 410256. Its totient is φ = 66240.

The previous prime is 201911. The next prime is 201919. The reversal of 201918 is 819102.

201918 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 201894 and 201903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 208 + ... + 668.

It is an arithmetic number, because the mean of its divisors is an integer number (25641).

2²⁰¹⁹¹⁸ is an apocalyptic number.

201918 is an abundant number, since it is smaller than the sum of its proper divisors (208338).

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

201918 is a wasteful number, since it uses less digits than its factorization.

201918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 539.

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 201918 is about 449.3528680224. The cubic root of 201918 is about 58.6667025367. Note that the first 3 decimals are identical.

The spelling of 201918 in words is "two hundred one thousand, nine hundred eighteen".