188820889 has 4 divisors (see below), whose sum is σ = 188930356. Its totient is φ = 188711424.

The previous prime is 188820883. The next prime is 188820899. The reversal of 188820889 is 988028881.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 988028881 = 7 ⋅141146983.

It can be written as a sum of positive squares in 2 ways, for example, as 94245264 + 94575625 = 9708^2 + 9725^2 .

It is a cyclic number.

It is not a de Polignac number, because 188820889 - 2¹⁵ = 188788121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (188820883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52104 + ... + 55609.

It is an arithmetic number, because the mean of its divisors is an integer number (47232589).

Almost surely, 2^188820889 is an apocalyptic number.

It is an amenable number.

188820889 is a deficient number, since it is larger than the sum of its proper divisors (109467).

188820889 is a wasteful number, since it uses less digits than its factorization.

188820889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109466.

The product of its (nonzero) digits is 589824, while the sum is 52.

The square root of 188820889 is about 13741.2113367054. The cubic root of 188820889 is about 573.6980133992.

The spelling of 188820889 in words is "one hundred eighty-eight million, eight hundred twenty thousand, eight hundred eighty-nine".