309340540 has 24 divisors (see below), whose sum is σ = 660628080. Its totient is φ = 121638528.

The previous prime is 309340523. The next prime is 309340543. The reversal of 309340540 is 45043903.

It is a junction number, because it is equal to n+sod(n) for n = 309340499 and 309340508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (309340543) 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, 129897 + ... + 132256.

It is an arithmetic number, because the mean of its divisors is an integer number (27526170).

Almost surely, 2^309340540 is an apocalyptic number.

It is an amenable number.

309340540 is an abundant number, since it is smaller than the sum of its proper divisors (351287540).

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

309340540 is a wasteful number, since it uses less digits than its factorization.

309340540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262221 (or 262219 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 28.

The square root of 309340540 is about 17588.0794858336. The cubic root of 309340540 is about 676.3096949387.

The spelling of 309340540 in words is "three hundred nine million, three hundred forty thousand, five hundred forty".