309397342 has 4 divisors (see below), whose sum is σ = 464096016. Its totient is φ = 154698670.

The previous prime is 309397327. The next prime is 309397343. The reversal of 309397342 is 243793903.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 243793903 = 743 ⋅328121.

It is a junction number, because it is equal to n+sod(n) for n = 309397295 and 309397304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (309397343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77349334 + ... + 77349337.

It is an arithmetic number, because the mean of its divisors is an integer number (116024004).

Almost surely, 2^309397342 is an apocalyptic number.

309397342 is a deficient number, since it is larger than the sum of its proper divisors (154698674).

309397342 is a wasteful number, since it uses less digits than its factorization.

309397342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154698673.

The product of its (nonzero) digits is 122472, while the sum is 40.

The square root of 309397342 is about 17589.6941985925. The cubic root of 309397342 is about 676.3510877159.

The spelling of 309397342 in words is "three hundred nine million, three hundred ninety-seven thousand, three hundred forty-two".