118638 has 32 divisors (see below), whose sum is σ = 285600. Its totient is φ = 36504.

The previous prime is 118633. The next prime is 118661. The reversal of 118638 is 836811.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an Ulam number.

Its product of digits (1152) is a multiple of the sum of its prime divisors (18).

It is a Curzon number.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (118633) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9120 + ... + 9132.

It is an arithmetic number, because the mean of its divisors is an integer number (8925).

2¹¹⁸⁶³⁸ is an apocalyptic number.

118638 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 118638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (142800).

118638 is an abundant number, since it is smaller than the sum of its proper divisors (166962).

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

118638 is an equidigital number, since it uses as much as digits as its factorization.

118638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50 (or 18 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 118638 is about 344.4386737868. The cubic root of 118638 is about 49.1369209459.

It can be divided in two parts, 11 and 8638, that added together give a square (8649 = 93²).

The spelling of 118638 in words is "one hundred eighteen thousand, six hundred thirty-eight".