1804539689 has 2 divisors, whose sum is σ = 1804539690. Its totient is φ = 1804539688.

The previous prime is 1804539673. The next prime is 1804539697. The reversal of 1804539689 is 9869354081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1281640000 + 522899689 = 35800^2 + 22867^2 .

It is a cyclic number.

It is not a de Polignac number, because 1804539689 - 2⁴ = 1804539673 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1804539689.

It is not a weakly prime, because it can be changed into another prime (1804539619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 902269844 + 902269845.

It is an arithmetic number, because the mean of its divisors is an integer number (902269845).

Almost surely, 2^1804539689 is an apocalyptic number.

It is an amenable number.

1804539689 is a deficient number, since it is larger than the sum of its proper divisors (1).

1804539689 is an equidigital number, since it uses as much as digits as its factorization.

1804539689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1866240, while the sum is 53.

The square root of 1804539689 is about 42479.8739287206. The cubic root of 1804539689 is about 1217.4621815445.

The spelling of 1804539689 in words is "one billion, eight hundred four million, five hundred thirty-nine thousand, six hundred eighty-nine".