426923209 has 2 divisors, whose sum is σ = 426923210. Its totient is φ = 426923208.

The previous prime is 426923207. The next prime is 426923249. The reversal of 426923209 is 902329624.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 402122809 + 24800400 = 20053^2 + 4980^2 .

It is a cyclic number.

It is not a de Polignac number, because 426923209 - 2¹ = 426923207 is a prime.

Together with 426923207, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (426923207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213461604 + 213461605.

It is an arithmetic number, because the mean of its divisors is an integer number (213461605).

Almost surely, 2^426923209 is an apocalyptic number.

It is an amenable number.

426923209 is a deficient number, since it is larger than the sum of its proper divisors (1).

426923209 is an equidigital number, since it uses as much as digits as its factorization.

426923209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 37.

The square root of 426923209 is about 20662.1201477486. The cubic root of 426923209 is about 752.9796776107.

The spelling of 426923209 in words is "four hundred twenty-six million, nine hundred twenty-three thousand, two hundred nine".