90918 has 12 divisors (see below), whose sum is σ = 197028. Its totient is φ = 30300.

The previous prime is 90917. The next prime is 90931. The reversal of 90918 is 81909.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 90891 and 90900.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 90918.

It is not an unprimeable number, because it can be changed into a prime (90911) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2508 + ... + 2543.

It is an arithmetic number, because the mean of its divisors is an integer number (16419).

2⁹⁰⁹¹⁸ is an apocalyptic number.

90918 is an abundant number, since it is smaller than the sum of its proper divisors (106110).

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

90918 is a wasteful number, since it uses less digits than its factorization.

90918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5059 (or 5056 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 90918 is about 301.5261182717. The cubic root of 90918 is about 44.9659000924.

Subtracting from 90918 its reverse (81909), we obtain a palindrome (9009).

The spelling of 90918 in words is "ninety thousand, nine hundred eighteen".