118391388 has 12 divisors (see below), whose sum is σ = 276246600. Its totient is φ = 39463792.

The previous prime is 118391363. The next prime is 118391389. The reversal of 118391388 is 883193811.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (118391389) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4932963 + ... + 4932986.

It is an arithmetic number, because the mean of its divisors is an integer number (23020550).

Almost surely, 2^118391388 is an apocalyptic number.

It is an amenable number.

118391388 is an abundant number, since it is smaller than the sum of its proper divisors (157855212).

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

118391388 is a wasteful number, since it uses less digits than its factorization.

118391388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9865956 (or 9865954 counting only the distinct ones).

The product of its digits is 41472, while the sum is 42.

The square root of 118391388 is about 10880.7806705218. The cubic root of 118391388 is about 491.0285046701.

The spelling of 118391388 in words is "one hundred eighteen million, three hundred ninety-one thousand, three hundred eighty-eight".