918630 has 48 divisors (see below), whose sum is σ = 2442960. Its totient is φ = 239424.

The previous prime is 918613. The next prime is 918641. The reversal of 918630 is 36819.

It is a junction number, because it is equal to n+sod(n) for n = 918594 and 918603.

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 918630.

It is an unprimeable number.

918630 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 23 ways as a sum of consecutive naturals, for example, 5224 + ... + 5396.

It is an arithmetic number, because the mean of its divisors is an integer number (50895).

2⁹¹⁸⁶³⁰ is an apocalyptic number.

918630 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 918630, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1221480).

918630 is an abundant number, since it is smaller than the sum of its proper divisors (1524330).

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

918630 is a wasteful number, since it uses less digits than its factorization.

918630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245 (or 242 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 918630 is about 958.4518767262. The cubic root of 918630 is about 97.2105815844.

It can be divided in two parts, 9186 and 30, that added together give a square (9216 = 96²).

The spelling of 918630 in words is "nine hundred eighteen thousand, six hundred thirty".