309220489 has 8 divisors (see below), whose sum is σ = 314754048. Its totient is φ = 303735600.

The previous prime is 309220469. The next prime is 309220501. The reversal of 309220489 is 984022903.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-309220489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (309220469) 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 7 ways as a sum of consecutive naturals, for example, 774 + ... + 24880.

It is an arithmetic number, because the mean of its divisors is an integer number (39344256).

Almost surely, 2^309220489 is an apocalyptic number.

It is an amenable number.

309220489 is a deficient number, since it is larger than the sum of its proper divisors (5533559).

309220489 is a wasteful number, since it uses less digits than its factorization.

309220489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24335.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 309220489 is about 17584.6663033451. Note that the first 3 decimals coincide. The cubic root of 309220489 is about 676.2221946490. Note that the first 3 decimals are identical.

The spelling of 309220489 in words is "three hundred nine million, two hundred twenty thousand, four hundred eighty-nine".