188809920 has 336 divisors, whose sum is σ = 735238560. Its totient is φ = 45342720.

The previous prime is 188809913. The next prime is 188809931. The reversal of 188809920 is 29908881.

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

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4605100 + ... + 4605140.

It is an arithmetic number, because the mean of its divisors is an integer number (2188210).

Almost surely, 2^188809920 is an apocalyptic number.

188809920 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 188809920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (367619280).

188809920 is an abundant number, since it is smaller than the sum of its proper divisors (546428640).

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

188809920 is a wasteful number, since it uses less digits than its factorization.

188809920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121 (or 64 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 45.

The square root of 188809920 is about 13740.8122030686. The cubic root of 188809920 is about 573.6869040787.

The spelling of 188809920 in words is "one hundred eighty-eight million, eight hundred nine thousand, nine hundred twenty".