285904189 has 2 divisors, whose sum is σ = 285904190. Its totient is φ = 285904188.

The previous prime is 285904141. The next prime is 285904211. The reversal of 285904189 is 981409582.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 196280100 + 89624089 = 14010^2 + 9467^2 .

It is a cyclic number.

It is not a de Polignac number, because 285904189 - 2⁷ = 285904061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (285902189) 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 as a sum of consecutive naturals, namely, 142952094 + 142952095.

It is an arithmetic number, because the mean of its divisors is an integer number (142952095).

Almost surely, 2^285904189 is an apocalyptic number.

It is an amenable number.

285904189 is a deficient number, since it is larger than the sum of its proper divisors (1).

285904189 is an equidigital number, since it uses as much as digits as its factorization.

285904189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 207360, while the sum is 46.

The square root of 285904189 is about 16908.7015764073. The cubic root of 285904189 is about 658.7796465239.

The spelling of 285904189 in words is "two hundred eighty-five million, nine hundred four thousand, one hundred eighty-nine".