309473989 has 4 divisors (see below), whose sum is σ = 337608000. Its totient is φ = 281339980.

The previous prime is 309473987. The next prime is 309474013. The reversal of 309473989 is 989374903.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 309473989 - 2¹ = 309473987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (309473987) 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, 14066989 + ... + 14067010.

It is an arithmetic number, because the mean of its divisors is an integer number (84402000).

Almost surely, 2^309473989 is an apocalyptic number.

It is an amenable number.

309473989 is a deficient number, since it is larger than the sum of its proper divisors (28134011).

309473989 is a wasteful number, since it uses less digits than its factorization.

309473989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28134010.

The product of its (nonzero) digits is 1469664, while the sum is 52.

The square root of 309473989 is about 17591.8728110454. The cubic root of 309473989 is about 676.4069339203.

The spelling of 309473989 in words is "three hundred nine million, four hundred seventy-three thousand, nine hundred eighty-nine".