290806393 has 2 divisors, whose sum is σ = 290806394. Its totient is φ = 290806392.

The previous prime is 290806391. The next prime is 290806409. The reversal of 290806393 is 393608092.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 289442169 + 1364224 = 17013^2 + 1168^2 .

It is a cyclic number.

It is not a de Polignac number, because 290806393 - 2¹ = 290806391 is a prime.

Together with 290806391, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (290806391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145403196 + 145403197.

It is an arithmetic number, because the mean of its divisors is an integer number (145403197).

Almost surely, 2^290806393 is an apocalyptic number.

It is an amenable number.

290806393 is a deficient number, since it is larger than the sum of its proper divisors (1).

290806393 is an equidigital number, since it uses as much as digits as its factorization.

290806393 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69984, while the sum is 40.

The square root of 290806393 is about 17053.0464433778. The cubic root of 290806393 is about 662.5235443395.

The spelling of 290806393 in words is "two hundred ninety million, eight hundred six thousand, three hundred ninety-three".