118278865 has 4 divisors (see below), whose sum is σ = 141934644. Its totient is φ = 94623088.

The previous prime is 118278863. The next prime is 118278883. The reversal of 118278865 is 568872811.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 25522704 + 92756161 = 5052^2 + 9631^2 .

It is a cyclic number.

It is not a de Polignac number, because 118278865 - 2¹ = 118278863 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (118278863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11827882 + ... + 11827891.

It is an arithmetic number, because the mean of its divisors is an integer number (35483661).

Almost surely, 2^118278865 is an apocalyptic number.

It is an amenable number.

118278865 is a deficient number, since it is larger than the sum of its proper divisors (23655779).

118278865 is an equidigital number, since it uses as much as digits as its factorization.

118278865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23655778.

The product of its digits is 215040, while the sum is 46.

The square root of 118278865 is about 10875.6087185959. The cubic root of 118278865 is about 490.8728922419.

The spelling of 118278865 in words is "one hundred eighteen million, two hundred seventy-eight thousand, eight hundred sixty-five".