118399865 has 4 divisors (see below), whose sum is σ = 142079844. Its totient is φ = 94719888.

The previous prime is 118399861. The next prime is 118399871. The reversal of 118399865 is 568993811.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 568993811 = 1669 ⋅340919.

It can be written as a sum of positive squares in 2 ways, for example, as 23843689 + 94556176 = 4883^2 + 9724^2 .

It is a cyclic number.

It is not a de Polignac number, because 118399865 - 2² = 118399861 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (118399861) 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, 11839982 + ... + 11839991.

It is an arithmetic number, because the mean of its divisors is an integer number (35519961).

Almost surely, 2^118399865 is an apocalyptic number.

It is an amenable number.

118399865 is a deficient number, since it is larger than the sum of its proper divisors (23679979).

118399865 is an equidigital number, since it uses as much as digits as its factorization.

118399865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23679978.

The product of its digits is 466560, while the sum is 50.

The square root of 118399865 is about 10881.1702036132. The cubic root of 118399865 is about 491.0402238483.

The spelling of 118399865 in words is "one hundred eighteen million, three hundred ninety-nine thousand, eight hundred sixty-five".