918138 has 32 divisors (see below), whose sum is σ = 2016000. Its totient is φ = 277056.

The previous prime is 918131. The next prime is 918139. The reversal of 918138 is 831819.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (918131) by changing a digit.

918138 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 15 ways as a sum of consecutive naturals, for example, 6088 + ... + 6236.

It is an arithmetic number, because the mean of its divisors is an integer number (63000).

2⁹¹⁸¹³⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 918138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1008000).

918138 is an abundant number, since it is smaller than the sum of its proper divisors (1097862).

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

918138 is a wasteful number, since it uses less digits than its factorization.

918138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246.

The product of its digits is 1728, while the sum is 30.

The square root of 918138 is about 958.1951784475. The cubic root of 918138 is about 97.1932237990.

The spelling of 918138 in words is "nine hundred eighteen thousand, one hundred thirty-eight".