309432340 has 48 divisors (see below), whose sum is σ = 774934272. Its totient is φ = 101477376.

The previous prime is 309432329. The next prime is 309432341. The reversal of 309432340 is 43234903.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 309432299 and 309432308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (309432341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44829 + ... + 51268.

It is an arithmetic number, because the mean of its divisors is an integer number (16144464).

Almost surely, 2^309432340 is an apocalyptic number.

It is an amenable number.

309432340 is an abundant number, since it is smaller than the sum of its proper divisors (465501932).

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

309432340 is a wasteful number, since it uses less digits than its factorization.

309432340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96136 (or 96134 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 28.

The square root of 309432340 is about 17590.6890143621. The cubic root of 309432340 is about 676.3765889508.

The spelling of 309432340 in words is "three hundred nine million, four hundred thirty-two thousand, three hundred forty".