309873312 has 144 divisors (see below), whose sum is σ = 1012519872. Its totient is φ = 88058880.

The previous prime is 309873301. The next prime is 309873341. The reversal of 309873312 is 213378903.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 566223 + ... + 566769.

It is an arithmetic number, because the mean of its divisors is an integer number (7031388).

Almost surely, 2^309873312 is an apocalyptic number.

309873312 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 309873312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (506259936).

309873312 is an abundant number, since it is smaller than the sum of its proper divisors (702646560).

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

309873312 is a wasteful number, since it uses less digits than its factorization.

309873312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 851 (or 840 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The square root of 309873312 is about 17603.2187965724. The cubic root of 309873312 is about 676.6977378481.

The spelling of 309873312 in words is "three hundred nine million, eight hundred seventy-three thousand, three hundred twelve".