118691823 has 4 divisors (see below), whose sum is σ = 158255768. Its totient is φ = 79127880.

The previous prime is 118691821. The next prime is 118691849. The reversal of 118691823 is 328196811.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 328196811 = 3 ⋅109398937.

It is not a de Polignac number, because 118691823 - 2¹ = 118691821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (118691821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19781968 + ... + 19781973.

It is an arithmetic number, because the mean of its divisors is an integer number (39563942).

Almost surely, 2^118691823 is an apocalyptic number.

118691823 is a deficient number, since it is larger than the sum of its proper divisors (39563945).

118691823 is an equidigital number, since it uses as much as digits as its factorization.

118691823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39563944.

The product of its digits is 20736, while the sum is 39.

The square root of 118691823 is about 10894.5776880061. The cubic root of 118691823 is about 491.4435054028.

The spelling of 118691823 in words is "one hundred eighteen million, six hundred ninety-one thousand, eight hundred twenty-three".