117691840 has 56 divisors (see below), whose sum is σ = 320296032. Its totient is φ = 40350720.

The previous prime is 117691823. The next prime is 117691879. The reversal of 117691840 is 48196711.

It is a tau number, because it is divible by the number of its divisors (56).

It is a self number, because there is not a number n which added to its sum of digits gives 117691840.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24031 + ... + 28510.

It is an arithmetic number, because the mean of its divisors is an integer number (5719572).

Almost surely, 2^117691840 is an apocalyptic number.

117691840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

117691840 is an abundant number, since it is smaller than the sum of its proper divisors (202604192).

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

117691840 is an equidigital number, since it uses as much as digits as its factorization.

117691840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52565 (or 52555 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 37.

The square root of 117691840 is about 10848.5870047670. The cubic root of 117691840 is about 490.0594680011.

The spelling of 117691840 in words is "one hundred seventeen million, six hundred ninety-one thousand, eight hundred forty".