309485725 has 6 divisors (see below), whose sum is σ = 383762330. Its totient is φ = 247588560.

The previous prime is 309485711. The next prime is 309485747. The reversal of 309485725 is 527584903.

It can be written as a sum of positive squares in 3 ways, for example, as 25462116 + 284023609 = 5046^2 + 16853^2 .

It is not a de Polignac number, because 309485725 - 2⁷ = 309485597 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6189690 + ... + 6189739.

Almost surely, 2^309485725 is an apocalyptic number.

It is an amenable number.

309485725 is a deficient number, since it is larger than the sum of its proper divisors (74276605).

309485725 is a wasteful number, since it uses less digits than its factorization.

309485725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12379439 (or 12379434 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 43.

The square root of 309485725 is about 17592.2063710042. The cubic root of 309485725 is about 676.4154841396.

The spelling of 309485725 in words is "three hundred nine million, four hundred eighty-five thousand, seven hundred twenty-five".