118921220 has 72 divisors (see below), whose sum is σ = 277132632. Its totient is φ = 42831360.

The previous prime is 118921213. The next prime is 118921223. The reversal of 118921220 is 22129811.

It can be written as a sum of positive squares in 4 ways, for example, as 2238016 + 116683204 = 1496^2 + 10802^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 118921220.

It is not an unprimeable number, because it can be changed into a prime (118921223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 379784 + ... + 380096.

Almost surely, 2^118921220 is an apocalyptic number.

118921220 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 118921220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (138566316).

118921220 is an abundant number, since it is smaller than the sum of its proper divisors (158211412).

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

118921220 is a wasteful number, since it uses less digits than its factorization.

118921220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501 (or 488 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 118921220 is about 10905.1006414430. The cubic root of 118921220 is about 491.7599077529.

The spelling of 118921220 in words is "one hundred eighteen million, nine hundred twenty-one thousand, two hundred twenty".