1890609073 has 2 divisors, whose sum is σ = 1890609074. Its totient is φ = 1890609072.

The previous prime is 1890609047. The next prime is 1890609103. The reversal of 1890609073 is 3709060981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1217102769 + 673506304 = 34887^2 + 25952^2 .

It is a cyclic number.

It is not a de Polignac number, because 1890609073 - 2²⁹ = 1353738161 is a prime.

It is not a weakly prime, because it can be changed into another prime (1890609043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 945304536 + 945304537.

It is an arithmetic number, because the mean of its divisors is an integer number (945304537).

Almost surely, 2^1890609073 is an apocalyptic number.

It is an amenable number.

1890609073 is a deficient number, since it is larger than the sum of its proper divisors (1).

1890609073 is an equidigital number, since it uses as much as digits as its factorization.

1890609073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 1890609073 is about 43481.1346793066. The cubic root of 1890609073 is about 1236.5183885673.

The spelling of 1890609073 in words is "one billion, eight hundred ninety million, six hundred nine thousand, seventy-three".