290806423 has 2 divisors, whose sum is σ = 290806424. Its totient is φ = 290806422.

The previous prime is 290806409. The next prime is 290806427. The reversal of 290806423 is 324608092.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 290806423 - 2⁵ = 290806391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (290806427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 145403211 + 145403212.

It is an arithmetic number, because the mean of its divisors is an integer number (145403212).

Almost surely, 2^290806423 is an apocalyptic number.

290806423 is a deficient number, since it is larger than the sum of its proper divisors (1).

290806423 is an equidigital number, since it uses as much as digits as its factorization.

290806423 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 290806423 is about 17053.0473229860. The cubic root of 290806423 is about 662.5235671218.

The spelling of 290806423 in words is "two hundred ninety million, eight hundred six thousand, four hundred twenty-three".