309912834 has 64 divisors (see below), whose sum is σ = 776355840. Its totient is φ = 80123520.

The previous prime is 309912829. The next prime is 309912847. The reversal of 309912834 is 438219903.

It is a junction number, because it is equal to n+sod(n) for n = 309912792 and 309912801.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 106207 + ... + 109085.

It is an arithmetic number, because the mean of its divisors is an integer number (12130560).

Almost surely, 2^309912834 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 309912834, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (388177920).

309912834 is an abundant number, since it is smaller than the sum of its proper divisors (466443006).

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

309912834 is a wasteful number, since it uses less digits than its factorization.

309912834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3135.

The product of its (nonzero) digits is 46656, while the sum is 39.

The square root of 309912834 is about 17604.3413395674. The cubic root of 309912834 is about 676.7265058532.

The spelling of 309912834 in words is "three hundred nine million, nine hundred twelve thousand, eight hundred thirty-four".