188808643 has 4 divisors (see below), whose sum is σ = 198745960. Its totient is φ = 178871328.

The previous prime is 188808637. The next prime is 188808661. The reversal of 188808643 is 346808881.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 188808643 - 2¹⁷ = 188677571 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 188808593 and 188808602.

It is not an unprimeable number, because it can be changed into a prime (188808623) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4968630 + ... + 4968667.

It is an arithmetic number, because the mean of its divisors is an integer number (49686490).

Almost surely, 2^188808643 is an apocalyptic number.

188808643 is a deficient number, since it is larger than the sum of its proper divisors (9937317).

188808643 is an equidigital number, since it uses as much as digits as its factorization.

188808643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9937316.

The product of its (nonzero) digits is 294912, while the sum is 46.

The square root of 188808643 is about 13740.7657355767. The cubic root of 188808643 is about 573.6856107147.

The spelling of 188808643 in words is "one hundred eighty-eight million, eight hundred eight thousand, six hundred forty-three".