309372923 has 2 divisors, whose sum is σ = 309372924. Its totient is φ = 309372922.

The previous prime is 309372913. The next prime is 309372961. The reversal of 309372923 is 329273903.

It is an a-pointer prime, because the next prime (309372961) can be obtained adding 309372923 to its sum of digits (38).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 309372923 - 2¹⁴ = 309356539 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (309372913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154686461 + 154686462.

It is an arithmetic number, because the mean of its divisors is an integer number (154686462).

Almost surely, 2^309372923 is an apocalyptic number.

309372923 is a deficient number, since it is larger than the sum of its proper divisors (1).

309372923 is an equidigital number, since it uses as much as digits as its factorization.

309372923 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 61236, while the sum is 38.

The square root of 309372923 is about 17589.0000568537. Note that the first 4 decimals coincide. The cubic root of 309372923 is about 676.3332937129. Note that the first 3 decimals are identical.

The spelling of 309372923 in words is "three hundred nine million, three hundred seventy-two thousand, nine hundred twenty-three".