309218739448 has 32 divisors (see below), whose sum is σ = 584795266560. Its totient is φ = 153275189760.

The previous prime is 309218739413. The next prime is 309218739491. The reversal of 309218739448 is 844937812903.

It is a super-2 number, since 2×309218739448² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 309218739392 and 309218739401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1226940 + ... + 1457332.

It is an arithmetic number, because the mean of its divisors is an integer number (18274852080).

Almost surely, 2^309218739448 is an apocalyptic number.

It is an amenable number.

309218739448 is a deficient number, since it is larger than the sum of its proper divisors (275576527112).

309218739448 is a wasteful number, since it uses less digits than its factorization.

309218739448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231847 (or 231843 counting only the distinct ones).

The product of its (nonzero) digits is 10450944, while the sum is 58.

The spelling of 309218739448 in words is "three hundred nine billion, two hundred eighteen million, seven hundred thirty-nine thousand, four hundred forty-eight".