118538865 has 24 divisors (see below), whose sum is σ = 205988328. Its totient is φ = 63060480.

The previous prime is 118538837. The next prime is 118538881. The reversal of 118538865 is 568835811.

It can be written as a sum of positive squares in 4 ways, for example, as 10732176 + 107806689 = 3276^2 + 10383^2 .

It is not a de Polignac number, because 118538865 - 2⁶ = 118538801 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 118538865.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15817 + ... + 22073.

It is an arithmetic number, because the mean of its divisors is an integer number (8582847).

Almost surely, 2^118538865 is an apocalyptic number.

118538865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

118538865 is a deficient number, since it is larger than the sum of its proper divisors (87449463).

118538865 is a wasteful number, since it uses less digits than its factorization.

118538865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6689 (or 6686 counting only the distinct ones).

The product of its digits is 230400, while the sum is 45.

The square root of 118538865 is about 10887.5555107655. Note that the first 4 decimals coincide. The cubic root of 118538865 is about 491.2323071149.

The spelling of 118538865 in words is "one hundred eighteen million, five hundred thirty-eight thousand, eight hundred sixty-five".