309427340 has 12 divisors (see below), whose sum is σ = 649797456. Its totient is φ = 123770928.

The previous prime is 309427333. The next prime is 309427343. The reversal of 309427340 is 43724903.

It is a junction number, because it is equal to n+sod(n) for n = 309427297 and 309427306.

It is not an unprimeable number, because it can be changed into a prime (309427343) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7735664 + ... + 7735703.

It is an arithmetic number, because the mean of its divisors is an integer number (54149788).

Almost surely, 2^309427340 is an apocalyptic number.

It is an amenable number.

309427340 is an abundant number, since it is smaller than the sum of its proper divisors (340370116).

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

309427340 is a wasteful number, since it uses less digits than its factorization.

309427340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15471376 (or 15471374 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 32.

The square root of 309427340 is about 17590.5468931469. The cubic root of 309427340 is about 676.3729458268.

The spelling of 309427340 in words is "three hundred nine million, four hundred twenty-seven thousand, three hundred forty".