309379072 has 60 divisors (see below), whose sum is σ = 646427376. Its totient is φ = 147783680.

The previous prime is 309379043. The next prime is 309379093. The reversal of 309379072 is 270973903.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 376422 + ... + 377242.

Almost surely, 2^309379072 is an apocalyptic number.

309379072 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 309379072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (323213688).

309379072 is an abundant number, since it is smaller than the sum of its proper divisors (337048304).

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

309379072 is an frugal number, since it uses more digits than its factorization.

309379072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 872 (or 846 counting only the distinct ones).

The product of its (nonzero) digits is 71442, while the sum is 40.

The square root of 309379072 is about 17589.1748527326. The cubic root of 309379072 is about 676.3377745466.

The spelling of 309379072 in words is "three hundred nine million, three hundred seventy-nine thousand, seventy-two".