309420285 has 32 divisors (see below), whose sum is σ = 513786240. Its totient is φ = 158823168.

The previous prime is 309420283. The next prime is 309420299. The reversal of 309420285 is 582024903.

It is a happy number.

It is not a de Polignac number, because 309420285 - 2¹ = 309420283 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (309420283) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 161302 + ... + 163208.

It is an arithmetic number, because the mean of its divisors is an integer number (16055820).

Almost surely, 2^309420285 is an apocalyptic number.

It is an amenable number.

309420285 is a deficient number, since it is larger than the sum of its proper divisors (204365955).

309420285 is a wasteful number, since it uses less digits than its factorization.

309420285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2317.

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 309420285 is about 17590.3463581591. The cubic root of 309420285 is about 676.3678053121.

The spelling of 309420285 in words is "three hundred nine million, four hundred twenty thousand, two hundred eighty-five".