118857 has 4 divisors (see below), whose sum is σ = 158480. Its totient is φ = 79236.

The previous prime is 118843. The next prime is 118861. The reversal of 118857 is 758811.

118857 = T₁₅₈ + T₁₅₉ + ... + T₁₆₆.

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: 758811 = 3 ⋅252937.

It is not a de Polignac number, because 118857 - 2¹⁰ = 117833 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (118897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19807 + ... + 19812.

It is an arithmetic number, because the mean of its divisors is an integer number (39620).

2¹¹⁸⁸⁵⁷ is an apocalyptic number.

It is an amenable number.

118857 is a deficient number, since it is larger than the sum of its proper divisors (39623).

118857 is an equidigital number, since it uses as much as digits as its factorization.

118857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39622.

The product of its digits is 2240, while the sum is 30.

The square root of 118857 is about 344.7564357630. The cubic root of 118857 is about 49.1671371528.

The spelling of 118857 in words is "one hundred eighteen thousand, eight hundred fifty-seven".