309420443 has 2 divisors, whose sum is σ = 309420444. Its totient is φ = 309420442.

The previous prime is 309420421. The next prime is 309420457. The reversal of 309420443 is 344024903.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 309420443 - 2⁶ = 309420379 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (309420473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154710221 + 154710222.

It is an arithmetic number, because the mean of its divisors is an integer number (154710222).

Almost surely, 2^309420443 is an apocalyptic number.

309420443 is a deficient number, since it is larger than the sum of its proper divisors (1).

309420443 is an equidigital number, since it uses as much as digits as its factorization.

309420443 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 309420443 is about 17590.3508492582. The cubic root of 309420443 is about 676.3679204372.

The spelling of 309420443 in words is "three hundred nine million, four hundred twenty thousand, four hundred forty-three".