189811925 has 6 divisors (see below), whose sum is σ = 235366818. Its totient is φ = 151849520.

The previous prime is 189811913. The next prime is 189811927. The reversal of 189811925 is 529118981.

It can be written as a sum of positive squares in 3 ways, for example, as 3598609 + 186213316 = 1897^2 + 13646^2 .

It is not a de Polignac number, because 189811925 - 2⁶ = 189811861 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189811927) 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 5 ways as a sum of consecutive naturals, for example, 3796214 + ... + 3796263.

It is an arithmetic number, because the mean of its divisors is an integer number (39227803).

Almost surely, 2^189811925 is an apocalyptic number.

It is an amenable number.

189811925 is a deficient number, since it is larger than the sum of its proper divisors (45554893).

189811925 is an equidigital number, since it uses as much as digits as its factorization.

189811925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7592487 (or 7592482 counting only the distinct ones).

The product of its digits is 51840, while the sum is 44.

The square root of 189811925 is about 13777.2248656977. The cubic root of 189811925 is about 574.6999568820.

The spelling of 189811925 in words is "one hundred eighty-nine million, eight hundred eleven thousand, nine hundred twenty-five".