309404742756 has 12 divisors (see below), whose sum is σ = 721944399792. Its totient is φ = 103134914248.

The previous prime is 309404742707. The next prime is 309404742763. The reversal of 309404742756 is 657247404903.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 309404742699 and 309404742708.

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 in 3 ways as a sum of consecutive naturals, for example, 12891864270 + ... + 12891864293.

It is an arithmetic number, because the mean of its divisors is an integer number (60162033316).

Almost surely, 2^309404742756 is an apocalyptic number.

It is an amenable number.

309404742756 is an abundant number, since it is smaller than the sum of its proper divisors (412539657036).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

309404742756 is a wasteful number, since it uses less digits than its factorization.

309404742756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25783728570 (or 25783728568 counting only the distinct ones).

The product of its (nonzero) digits is 5080320, while the sum is 51.

The spelling of 309404742756 in words is "three hundred nine billion, four hundred four million, seven hundred forty-two thousand, seven hundred fifty-six".