1808042393 has 2 divisors, whose sum is σ = 1808042394. Its totient is φ = 1808042392.

The previous prime is 1808042377. The next prime is 1808042399. The reversal of 1808042393 is 3932408081.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1422194944 + 385847449 = 37712^2 + 19643^2 .

It is a cyclic number.

It is not a de Polignac number, because 1808042393 - 2⁴ = 1808042377 is a prime.

It is not a weakly prime, because it can be changed into another prime (1808042399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 904021196 + 904021197.

It is an arithmetic number, because the mean of its divisors is an integer number (904021197).

Almost surely, 2^1808042393 is an apocalyptic number.

It is an amenable number.

1808042393 is a deficient number, since it is larger than the sum of its proper divisors (1).

1808042393 is an equidigital number, since it uses as much as digits as its factorization.

1808042393 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 1808042393 is about 42521.0817477637. The cubic root of 1808042393 is about 1218.2493912514.

The spelling of 1808042393 in words is "one billion, eight hundred eight million, forty-two thousand, three hundred ninety-three".