117839940 has 24 divisors (see below), whose sum is σ = 329952000. Its totient is φ = 31423968.

The previous prime is 117839923. The next prime is 117839941. The reversal of 117839940 is 49938711.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 117839892 and 117839901.

It is not an unprimeable number, because it can be changed into a prime (117839941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 981940 + ... + 982059.

It is an arithmetic number, because the mean of its divisors is an integer number (13748000).

Almost surely, 2^117839940 is an apocalyptic number.

117839940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

117839940 is an abundant number, since it is smaller than the sum of its proper divisors (212112060).

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

117839940 is a wasteful number, since it uses less digits than its factorization.

117839940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1964011 (or 1964009 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 42.

The square root of 117839940 is about 10855.4106324911. The cubic root of 117839940 is about 490.2649407148.

The spelling of 117839940 in words is "one hundred seventeen million, eight hundred thirty-nine thousand, nine hundred forty".