309430215 has 12 divisors (see below), whose sum is σ = 536345784. Its totient is φ = 165029424.

The previous prime is 309430183. The next prime is 309430229. The reversal of 309430215 is 512034903.

It is not a de Polignac number, because 309430215 - 2⁵ = 309430183 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3438069 + ... + 3438158.

It is an arithmetic number, because the mean of its divisors is an integer number (44695482).

Almost surely, 2^309430215 is an apocalyptic number.

309430215 is a deficient number, since it is larger than the sum of its proper divisors (226915569).

309430215 is a wasteful number, since it uses less digits than its factorization.

309430215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6876238 (or 6876235 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 309430215 is about 17590.6286129859. The cubic root of 309430215 is about 676.3750406279.

The spelling of 309430215 in words is "three hundred nine million, four hundred thirty thousand, two hundred fifteen".