309830947 has 4 divisors (see below), whose sum is σ = 310926040. Its totient is φ = 308735856.

The previous prime is 309830903. The next prime is 309830959. The reversal of 309830947 is 749038903.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 749038903 = 10139 ⋅73877.

It is a cyclic number.

It is not a de Polignac number, because 309830947 - 2¹¹ = 309828899 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (309830977) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 547122 + ... + 547687.

It is an arithmetic number, because the mean of its divisors is an integer number (77731510).

Almost surely, 2^309830947 is an apocalyptic number.

309830947 is a deficient number, since it is larger than the sum of its proper divisors (1095093).

309830947 is a wasteful number, since it uses less digits than its factorization.

309830947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1095092.

The product of its (nonzero) digits is 163296, while the sum is 43.

The square root of 309830947 is about 17602.0154243768. The cubic root of 309830947 is about 676.6668977110. Note that the first 3 decimals are identical.

The spelling of 309830947 in words is "three hundred nine million, eight hundred thirty thousand, nine hundred forty-seven".