309220830 has 48 divisors (see below), whose sum is σ = 806901264. Its totient is φ = 82158720.

The previous prime is 309220817. The next prime is 309220841. The reversal of 309220830 is 38022903.

It is a junction number, because it is equal to n+sod(n) for n = 309220794 and 309220803.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19177 + ... + 31403.

It is an arithmetic number, because the mean of its divisors is an integer number (16810443).

Almost surely, 2^309220830 is an apocalyptic number.

309220830 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

309220830 is an abundant number, since it is smaller than the sum of its proper divisors (497680434).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

309220830 is a wasteful number, since it uses less digits than its factorization.

309220830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12521 (or 12518 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 309220830 is about 17584.6759992898. The cubic root of 309220830 is about 676.2224432221. Note that the first 3 decimals are identical.

The spelling of 309220830 in words is "three hundred nine million, two hundred twenty thousand, eight hundred thirty".