118791990 has 96 divisors (see below), whose sum is σ = 328273920. Its totient is φ = 29719872.

The previous prime is 118791973. The next prime is 118791991. The reversal of 118791990 is 99197811.

It is a super-2 number, since 2×118791990² = 28223073776320200, which contains 22 as substring.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (118791991) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 216897 + ... + 217443.

It is an arithmetic number, because the mean of its divisors is an integer number (3419520).

Almost surely, 2^118791990 is an apocalyptic number.

118791990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 118791990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (164136960).

118791990 is an abundant number, since it is smaller than the sum of its proper divisors (209481930).

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

118791990 is a wasteful number, since it uses less digits than its factorization.

118791990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 706 (or 703 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 45.

The square root of 118791990 is about 10899.1738219004. The cubic root of 118791990 is about 491.5817136889.

The spelling of 118791990 in words is "one hundred eighteen million, seven hundred ninety-one thousand, nine hundred ninety".