309437242 has 8 divisors (see below), whose sum is σ = 467544276. Its totient is φ = 153589152.

The previous prime is 309437231. The next prime is 309437243. The reversal of 309437242 is 242734903.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 288286441 + 21150801 = 16979^2 + 4599^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 309437198 and 309437207.

It is not an unprimeable number, because it can be changed into a prime (309437243) 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, 564393 + ... + 564940.

Almost surely, 2^309437242 is an apocalyptic number.

309437242 is a deficient number, since it is larger than the sum of its proper divisors (158107034).

309437242 is a wasteful number, since it uses less digits than its factorization.

309437242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1129472.

The product of its (nonzero) digits is 36288, while the sum is 34.

The square root of 309437242 is about 17590.8283488868. The cubic root of 309437242 is about 676.3801606315.

The spelling of 309437242 in words is "three hundred nine million, four hundred thirty-seven thousand, two hundred forty-two".