309380 has 24 divisors (see below), whose sum is σ = 672000. Its totient is φ = 119520.

The previous prime is 309371. The next prime is 309391. The reversal of 309380 is 83903.

It is a nialpdrome in base 13.

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 7 ways as a sum of consecutive naturals, for example, 371 + ... + 869.

It is an arithmetic number, because the mean of its divisors is an integer number (28000).

2³⁰⁹³⁸⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 309380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (336000).

309380 is an abundant number, since it is smaller than the sum of its proper divisors (362620).

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

309380 is a wasteful number, since it uses less digits than its factorization.

309380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 539 (or 537 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 309380 is about 556.2193811798. The cubic root of 309380 is about 67.6338450784.

The spelling of 309380 in words is "three hundred nine thousand, three hundred eighty".