117961840 has 20 divisors (see below), whose sum is σ = 274261464. Its totient is φ = 47184704.

The previous prime is 117961819. The next prime is 117961843. The reversal of 117961840 is 48169711.

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 117961840.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117961843) 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, 737182 + ... + 737341.

Almost surely, 2^117961840 is an apocalyptic number.

117961840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

117961840 is an abundant number, since it is smaller than the sum of its proper divisors (156299624).

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

117961840 is a wasteful number, since it uses less digits than its factorization.

117961840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1474536 (or 1474530 counting only the distinct ones).

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

The square root of 117961840 is about 10861.0238928013. The cubic root of 117961840 is about 490.4339346361.

The spelling of 117961840 in words is "one hundred seventeen million, nine hundred sixty-one thousand, eight hundred forty".