117771840 has 224 divisors, whose sum is σ = 426476160. Its totient is φ = 30578688.

The previous prime is 117771839. The next prime is 117771853. The reversal of 117771840 is 48177711.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 117771795 and 117771804.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 371362 + ... + 371678.

Almost surely, 2^117771840 is an apocalyptic number.

117771840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 117771840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (213238080).

117771840 is an abundant number, since it is smaller than the sum of its proper divisors (308704320).

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

117771840 is a wasteful number, since it uses less digits than its factorization.

117771840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 386 (or 370 counting only the distinct ones).

The product of its (nonzero) digits is 10976, while the sum is 36.

The square root of 117771840 is about 10852.2734945264. The cubic root of 117771840 is about 490.1704807322.

The spelling of 117771840 in words is "one hundred seventeen million, seven hundred seventy-one thousand, eight hundred forty".