117978240 has 128 divisors (see below), whose sum is σ = 385070400. Its totient is φ = 30707712.

The previous prime is 117978233. The next prime is 117978241. The reversal of 117978240 is 42879711.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×117978240² = 27837730226995200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (117978241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81846 + ... + 83274.

Almost surely, 2^117978240 is an apocalyptic number.

117978240 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 117978240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (192535200).

117978240 is an abundant number, since it is smaller than the sum of its proper divisors (267092160).

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

117978240 is a wasteful number, since it uses less digits than its factorization.

117978240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1494 (or 1482 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 39.

The square root of 117978240 is about 10861.7788598369. The cubic root of 117978240 is about 490.4566616010.

The spelling of 117978240 in words is "one hundred seventeen million, nine hundred seventy-eight thousand, two hundred forty".