189405225 has 18 divisors (see below), whose sum is σ = 339246206. Its totient is φ = 101016000.

The previous prime is 189405197. The next prime is 189405263. The reversal of 189405225 is 522504981.

It can be written as a sum of positive squares in 3 ways, for example, as 20820969 + 168584256 = 4563^2 + 12984^2 .

It is not a de Polignac number, because 189405225 - 2⁵ = 189405193 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 189405225.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 420676 + ... + 421125.

Almost surely, 2^189405225 is an apocalyptic number.

189405225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

189405225 is a deficient number, since it is larger than the sum of its proper divisors (149840981).

189405225 is a wasteful number, since it uses less digits than its factorization.

189405225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 841817 (or 841809 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The square root of 189405225 is about 13762.4570844018. The cubic root of 189405225 is about 574.2892036141.

The spelling of 189405225 in words is "one hundred eighty-nine million, four hundred five thousand, two hundred twenty-five".