1843990421813 has 2 divisors, whose sum is σ = 1843990421814. Its totient is φ = 1843990421812.

The previous prime is 1843990421789. The next prime is 1843990421839. The reversal of 1843990421813 is 3181240993481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1383218266609 + 460772155204 = 1176103^2 + 678802^2 .

It is a cyclic number.

It is not a de Polignac number, because 1843990421813 - 2¹⁴ = 1843990405429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1843990421213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 921995210906 + 921995210907.

It is an arithmetic number, because the mean of its divisors is an integer number (921995210907).

Almost surely, 2^{1843990421813} is an apocalyptic number.

It is an amenable number.

1843990421813 is a deficient number, since it is larger than the sum of its proper divisors (1).

1843990421813 is an equidigital number, since it uses as much as digits as its factorization.

1843990421813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1492992, while the sum is 53.

The spelling of 1843990421813 in words is "one trillion, eight hundred forty-three billion, nine hundred ninety million, four hundred twenty-one thousand, eight hundred thirteen".