309403140 has 24 divisors (see below), whose sum is σ = 866328960. Its totient is φ = 82507488.

The previous prime is 309403123. The next prime is 309403147. The reversal of 309403140 is 41304903.

It is a self number, because there is not a number n which added to its sum of digits gives 309403140.

It is not an unprimeable number, because it can be changed into a prime (309403147) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 2578300 + ... + 2578419.

It is an arithmetic number, because the mean of its divisors is an integer number (36097040).

Almost surely, 2^309403140 is an apocalyptic number.

309403140 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

309403140 is an abundant number, since it is smaller than the sum of its proper divisors (556925820).

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

309403140 is a wasteful number, since it uses less digits than its factorization.

309403140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5156731 (or 5156729 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 309403140 is about 17589.8590102366. The cubic root of 309403140 is about 676.3553125519.

The spelling of 309403140 in words is "three hundred nine million, four hundred three thousand, one hundred forty".