118209138 has 16 divisors (see below), whose sum is σ = 244045056. Its totient is φ = 38131920.

The previous prime is 118209137. The next prime is 118209149. The reversal of 118209138 is 831902811.

It is a junction number, because it is equal to n+sod(n) for n = 118209099 and 118209108.

It is not an unprimeable number, because it can be changed into a prime (118209131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 317581 + ... + 317952.

It is an arithmetic number, because the mean of its divisors is an integer number (15252816).

Almost surely, 2^118209138 is an apocalyptic number.

118209138 is an abundant number, since it is smaller than the sum of its proper divisors (125835918).

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

118209138 is a wasteful number, since it uses less digits than its factorization.

118209138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 635569.

The product of its (nonzero) digits is 3456, while the sum is 33.

The square root of 118209138 is about 10872.4025863652. The cubic root of 118209138 is about 490.7764145318.

The spelling of 118209138 in words is "one hundred eighteen million, two hundred nine thousand, one hundred thirty-eight".