117851840 has 28 divisors (see below), whose sum is σ = 280635456. Its totient is φ = 47140608.

The previous prime is 117851831. The next prime is 117851843. The reversal of 117851840 is 48158711.

It is a self number, because there is not a number n which added to its sum of digits gives 117851840.

It is not an unprimeable number, because it can be changed into a prime (117851843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 183824 + ... + 184463.

Almost surely, 2^117851840 is an apocalyptic number.

117851840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

117851840 is an abundant number, since it is smaller than the sum of its proper divisors (162783616).

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

117851840 is an equidigital number, since it uses as much as digits as its factorization.

117851840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368304 (or 368294 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 35.

The square root of 117851840 is about 10855.9587324197. The cubic root of 117851840 is about 490.2814432023.

The spelling of 117851840 in words is "one hundred seventeen million, eight hundred fifty-one thousand, eight hundred forty".