117987840 has 200 divisors, whose sum is σ = 423337860. Its totient is φ = 31408128.

The previous prime is 117987833. The next prime is 117987851. The reversal of 117987840 is 48789711.

It can be written as a sum of positive squares in 2 ways, for example, as 110502144 + 7485696 = 10512^2 + 2736^2 .

It is a super-2 number, since 2×117987840² = 27842260775731200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 207076 + ... + 207644.

Almost surely, 2^117987840 is an apocalyptic number.

117987840 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 117987840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (211668930).

117987840 is an abundant number, since it is smaller than the sum of its proper divisors (305350020).

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

117987840 is an frugal number, since it uses more digits than its factorization.

117987840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 604 (or 579 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 45.

The square root of 117987840 is about 10862.2207674122. The cubic root of 117987840 is about 490.4699642130.

The spelling of 117987840 in words is "one hundred seventeen million, nine hundred eighty-seven thousand, eight hundred forty".