309445831018 has 8 divisors (see below), whose sum is σ = 484349996448. Its totient is φ = 147995832204.

The previous prime is 309445830971. The next prime is 309445831021. The reversal of 309445831018 is 810138544903.

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

It is a super-2 number, since 2×309445831018² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (46), and also a Moran number because the ratio is a prime number: 6727083283 = 309445831018 / (3 + 0 + 9 + 4 + 4 + 5 + 8 + 3 + 1 + 0 + 1 + 8).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3363541596 + ... + 3363541687.

It is an arithmetic number, because the mean of its divisors is an integer number (60543749556).

Almost surely, 2^309445831018 is an apocalyptic number.

309445831018 is a deficient number, since it is larger than the sum of its proper divisors (174904165430).

309445831018 is a wasteful number, since it uses less digits than its factorization.

309445831018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6727083308.

The product of its (nonzero) digits is 414720, while the sum is 46.

The spelling of 309445831018 in words is "three hundred nine billion, four hundred forty-five million, eight hundred thirty-one thousand, eighteen".