118138636 has 48 divisors (see below), whose sum is σ = 263273472. Its totient is φ = 45043200.

The previous prime is 118138619. The next prime is 118138667. The reversal of 118138636 is 636831811.

It is a junction number, because it is equal to n+sod(n) for n = 118138595 and 118138604.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10396 + ... + 18556.

It is an arithmetic number, because the mean of its divisors is an integer number (5484864).

Almost surely, 2^118138636 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 118138636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (131636736).

118138636 is an abundant number, since it is smaller than the sum of its proper divisors (145134836).

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

118138636 is a wasteful number, since it uses less digits than its factorization.

118138636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8230 (or 8228 counting only the distinct ones).

The product of its digits is 20736, while the sum is 37.

The square root of 118138636 is about 10869.1598571371. The cubic root of 118138636 is about 490.6788259120.

It can be divided in two parts, 11813 and 8636, that added together give a square (20449 = 143²).

The spelling of 118138636 in words is "one hundred eighteen million, one hundred thirty-eight thousand, six hundred thirty-six".