309783945706 has 4 divisors (see below), whose sum is σ = 464675918562. Its totient is φ = 154891972852.

The previous prime is 309783945677. The next prime is 309783945739. The reversal of 309783945706 is 607549387903.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 607549387903 = 9241 ⋅65744983.

It can be written as a sum of positive squares in only one way, i.e., 220720496481 + 89063449225 = 469809^2 + 298435^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77445986425 + ... + 77445986428.

Almost surely, 2^309783945706 is an apocalyptic number.

309783945706 is a deficient number, since it is larger than the sum of its proper divisors (154891972856).

309783945706 is a wasteful number, since it uses less digits than its factorization.

309783945706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154891972855.

The product of its (nonzero) digits is 34292160, while the sum is 61.

The spelling of 309783945706 in words is "three hundred nine billion, seven hundred eighty-three million, nine hundred forty-five thousand, seven hundred six".