309909923 has 2 divisors, whose sum is σ = 309909924. Its totient is φ = 309909922.

The previous prime is 309909911. The next prime is 309909937. The reversal of 309909923 is 329909903.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 309909923 - 2⁸ = 309909667 is a prime.

It is equal to p_16759925 and since 309909923 and 16759925 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (309989923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154954961 + 154954962.

It is an arithmetic number, because the mean of its divisors is an integer number (154954962).

Almost surely, 2^309909923 is an apocalyptic number.

309909923 is a deficient number, since it is larger than the sum of its proper divisors (1).

309909923 is an equidigital number, since it uses as much as digits as its factorization.

309909923 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 118098, while the sum is 44.

The square root of 309909923 is about 17604.2586609036. The cubic root of 309909923 is about 676.7243870241.

The spelling of 309909923 in words is "three hundred nine million, nine hundred nine thousand, nine hundred twenty-three".