118581840 has 320 divisors, whose sum is σ = 454970880. Its totient is φ = 28200960.

The previous prime is 118581839. The next prime is 118581871. The reversal of 118581840 is 48185811.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 118581795 and 118581804.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1151229 + ... + 1151331.

It is an arithmetic number, because the mean of its divisors is an integer number (1421784).

Almost surely, 2^118581840 is an apocalyptic number.

118581840 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 118581840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (227485440).

118581840 is an abundant number, since it is smaller than the sum of its proper divisors (336389040).

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

118581840 is a wasteful number, since it uses less digits than its factorization.

118581840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179 (or 167 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 36.

The square root of 118581840 is about 10889.5289154306. The cubic root of 118581840 is about 491.2916636186.

The spelling of 118581840 in words is "one hundred eighteen million, five hundred eighty-one thousand, eight hundred forty".