118685820 has 48 divisors (see below), whose sum is σ = 362533248. Its totient is φ = 28772160.

The previous prime is 118685813. The next prime is 118685843. The reversal of 118685820 is 28586811.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89254 + ... + 90573.

It is an arithmetic number, because the mean of its divisors is an integer number (7552776).

Almost surely, 2^118685820 is an apocalyptic number.

118685820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

118685820 is an abundant number, since it is smaller than the sum of its proper divisors (243847428).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

118685820 is a wasteful number, since it uses less digits than its factorization.

118685820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179850 (or 179848 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 39.

The square root of 118685820 is about 10894.3021804978. The cubic root of 118685820 is about 491.4352201224.

Subtracting from 118685820 its reverse (28586811), we obtain a palindrome (90099009).

The spelling of 118685820 in words is "one hundred eighteen million, six hundred eighty-five thousand, eight hundred twenty".