118121990 has 32 divisors (see below), whose sum is σ = 246426624. Its totient is φ = 39926880.

The previous prime is 118121987. The next prime is 118121999. The reversal of 118121990 is 99121811.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (118121999) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 6914 + ... + 16853.

It is an arithmetic number, because the mean of its divisors is an integer number (7700832).

Almost surely, 2^118121990 is an apocalyptic number.

118121990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

118121990 is an abundant number, since it is smaller than the sum of its proper divisors (128304634).

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

118121990 is a wasteful number, since it uses less digits than its factorization.

118121990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23852.

The product of its (nonzero) digits is 1296, while the sum is 32.

The square root of 118121990 is about 10868.3940856044. The cubic root of 118121990 is about 490.6557789121.

The spelling of 118121990 in words is "one hundred eighteen million, one hundred twenty-one thousand, nine hundred ninety".