309485923 has 4 divisors (see below), whose sum is σ = 309991408. Its totient is φ = 308980440.

The previous prime is 309485899. The next prime is 309485951. The reversal of 309485923 is 329584903.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 329584903 = 1907 ⋅172829.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-309485923 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 309485923.

It is not an unprimeable number, because it can be changed into a prime (309485023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 251823 + ... + 253048.

It is an arithmetic number, because the mean of its divisors is an integer number (77497852).

Almost surely, 2^309485923 is an apocalyptic number.

309485923 is a deficient number, since it is larger than the sum of its proper divisors (505485).

309485923 is an equidigital number, since it uses as much as digits as its factorization.

309485923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505484.

The product of its (nonzero) digits is 233280, while the sum is 43.

The square root of 309485923 is about 17592.2119984952. The cubic root of 309485923 is about 676.4156283899.

The spelling of 309485923 in words is "three hundred nine million, four hundred eighty-five thousand, nine hundred twenty-three".