188993980 has 72 divisors (see below), whose sum is σ = 476654976. Its totient is φ = 62697600.

The previous prime is 188993971. The next prime is 188993983. The reversal of 188993980 is 89399881.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (188993983) 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, 27270 + ... + 33490.

It is an arithmetic number, because the mean of its divisors is an integer number (6620208).

Almost surely, 2^188993980 is an apocalyptic number.

188993980 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 188993980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (238327488).

188993980 is an abundant number, since it is smaller than the sum of its proper divisors (287660996).

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

188993980 is a wasteful number, since it uses less digits than its factorization.

188993980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6275 (or 6266 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 55.

The square root of 188993980 is about 13747.5081378408. The cubic root of 188993980 is about 573.8732617270.

It can be divided in two parts, 18 and 8993980, that added together give a palindrome (8993998).

The spelling of 188993980 in words is "one hundred eighty-eight million, nine hundred ninety-three thousand, nine hundred eighty".