309921234 has 16 divisors (see below), whose sum is σ = 708391488. Its totient is φ = 88548912.

The previous prime is 309921233. The next prime is 309921247. The reversal of 309921234 is 432129903.

It is a junction number, because it is equal to n+sod(n) for n = 309921195 and 309921204.

It is not an unprimeable number, because it can be changed into a prime (309921233) 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, 3689497 + ... + 3689580.

It is an arithmetic number, because the mean of its divisors is an integer number (44274468).

Almost surely, 2^309921234 is an apocalyptic number.

309921234 is an abundant number, since it is smaller than the sum of its proper divisors (398470254).

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

309921234 is a wasteful number, since it uses less digits than its factorization.

309921234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7379089.

The product of its (nonzero) digits is 11664, while the sum is 33.

The square root of 309921234 is about 17604.5799154652. The cubic root of 309921234 is about 676.7326198856.

The spelling of 309921234 in words is "three hundred nine million, nine hundred twenty-one thousand, two hundred thirty-four".