117857820 has 24 divisors (see below), whose sum is σ = 330002064. Its totient is φ = 31428736.

The previous prime is 117857801. The next prime is 117857833. The reversal of 117857820 is 28758711.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 982089 + ... + 982208.

It is an arithmetic number, because the mean of its divisors is an integer number (13750086).

Almost surely, 2^117857820 is an apocalyptic number.

117857820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

117857820 is an abundant number, since it is smaller than the sum of its proper divisors (212144244).

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

117857820 is a wasteful number, since it uses less digits than its factorization.

117857820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1964309 (or 1964307 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 39.

The square root of 117857820 is about 10856.2341537017. The cubic root of 117857820 is about 490.2897356296.

The spelling of 117857820 in words is "one hundred seventeen million, eight hundred fifty-seven thousand, eight hundred twenty".