309787975396 has 81 divisors (see below), whose sum is σ = 581977194057. Its totient is φ = 144267091200.

The previous prime is 309787975381. The next prime is 309787975397. The reversal of 309787975396 is 693579787903.

The square root of 309787975396 is 556586.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 139106620900 + 170681354496 = 372970^2 + 413136^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (309787975397) by changing a digit.

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 26 ways as a sum of consecutive naturals, for example, 2051575921 + ... + 2051576071.

Almost surely, 2^309787975396 is an apocalyptic number.

309787975396 is the 556586-th square number.

It is an amenable number.

309787975396 is a deficient number, since it is larger than the sum of its proper divisors (272189218661).

309787975396 is an equidigital number, since it uses as much as digits as its factorization.

309787975396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538 (or 269 counting only the distinct ones).

The product of its (nonzero) digits is 540101520, while the sum is 73.

The spelling of 309787975396 in words is "three hundred nine billion, seven hundred eighty-seven million, nine hundred seventy-five thousand, three hundred ninety-six".