188720238 has 32 divisors (see below), whose sum is σ = 432506880. Its totient is φ = 53776800.

The previous prime is 188720209. The next prime is 188720261. The reversal of 188720238 is 832027881.

It is a junction number, because it is equal to n+sod(n) for n = 188720196 and 188720205.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10563 + ... + 22113.

It is an arithmetic number, because the mean of its divisors is an integer number (13515840).

Almost surely, 2^188720238 is an apocalyptic number.

188720238 is an abundant number, since it is smaller than the sum of its proper divisors (243786642).

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

188720238 is a wasteful number, since it uses less digits than its factorization.

188720238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11952.

The product of its (nonzero) digits is 43008, while the sum is 39.

The square root of 188720238 is about 13737.5484712521. The cubic root of 188720238 is about 573.5960586807.

The spelling of 188720238 in words is "one hundred eighty-eight million, seven hundred twenty thousand, two hundred thirty-eight".