309686423 has 2 divisors, whose sum is σ = 309686424. Its totient is φ = 309686422.

The previous prime is 309686417. The next prime is 309686441. The reversal of 309686423 is 324686903.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 309686423 - 2⁶ = 309686359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (309686483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154843211 + 154843212.

It is an arithmetic number, because the mean of its divisors is an integer number (154843212).

Almost surely, 2^309686423 is an apocalyptic number.

309686423 is a deficient number, since it is larger than the sum of its proper divisors (1).

309686423 is an equidigital number, since it uses as much as digits as its factorization.

309686423 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 186624, while the sum is 41.

The square root of 309686423 is about 17597.9096201793. The cubic root of 309686423 is about 676.5616684805.

The spelling of 309686423 in words is "three hundred nine million, six hundred eighty-six thousand, four hundred twenty-three".