1805680493 has 2 divisors, whose sum is σ = 1805680494. Its totient is φ = 1805680492.

The previous prime is 1805680469. The next prime is 1805680507. The reversal of 1805680493 is 3940865081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1493204164 + 312476329 = 38642^2 + 17677^2 .

It is a cyclic number.

It is not a de Polignac number, because 1805680493 - 2¹⁶ = 1805614957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1805680403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 902840246 + 902840247.

It is an arithmetic number, because the mean of its divisors is an integer number (902840247).

Almost surely, 2^1805680493 is an apocalyptic number.

It is an amenable number.

1805680493 is a deficient number, since it is larger than the sum of its proper divisors (1).

1805680493 is an equidigital number, since it uses as much as digits as its factorization.

1805680493 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 44.

The square root of 1805680493 is about 42493.2993894332. The cubic root of 1805680493 is about 1217.7186815188.

The spelling of 1805680493 in words is "one billion, eight hundred five million, six hundred eighty thousand, four hundred ninety-three".