188371889 has 2 divisors, whose sum is σ = 188371890. Its totient is φ = 188371888.

The previous prime is 188371867. The next prime is 188371919. The reversal of 188371889 is 988173881.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124099600 + 64272289 = 11140^2 + 8017^2 .

It is a cyclic number.

It is not a de Polignac number, because 188371889 - 2¹² = 188367793 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 188371889.

It is not a weakly prime, because it can be changed into another prime (188371789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94185944 + 94185945.

It is an arithmetic number, because the mean of its divisors is an integer number (94185945).

Almost surely, 2^188371889 is an apocalyptic number.

It is an amenable number.

188371889 is a deficient number, since it is larger than the sum of its proper divisors (1).

188371889 is an equidigital number, since it uses as much as digits as its factorization.

188371889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 774144, while the sum is 53.

The square root of 188371889 is about 13724.8638973215. The cubic root of 188371889 is about 573.2429174693.

The spelling of 188371889 in words is "one hundred eighty-eight million, three hundred seventy-one thousand, eight hundred eighty-nine".