118827809 has 4 divisors (see below), whose sum is σ = 119266560. Its totient is φ = 118389060.

The previous prime is 118827803. The next prime is 118827811. The reversal of 118827809 is 908728811.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 908728811 = 12613 ⋅72047.

It is not a de Polignac number, because 118827809 - 2²⁴ = 102050593 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 118827809.

It is not an unprimeable number, because it can be changed into a prime (118827803) 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, 218969 + ... + 219510.

It is an arithmetic number, because the mean of its divisors is an integer number (29816640).

Almost surely, 2^118827809 is an apocalyptic number.

It is an amenable number.

118827809 is a deficient number, since it is larger than the sum of its proper divisors (438751).

118827809 is an equidigital number, since it uses as much as digits as its factorization.

118827809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438750.

The product of its (nonzero) digits is 64512, while the sum is 44.

The square root of 118827809 is about 10900.8168959945. The cubic root of 118827809 is about 491.6311171207.

It can be divided in two parts, 11882 and 7809, that added together give a palindrome (19691).

The spelling of 118827809 in words is "one hundred eighteen million, eight hundred twenty-seven thousand, eight hundred nine".