309530425 has 18 divisors (see below), whose sum is σ = 405093678. Its totient is φ = 234584640.

The previous prime is 309530423. The next prime is 309530447. The reversal of 309530425 is 524035903.

It can be written as a sum of positive squares in 3 ways, for example, as 79067664 + 230462761 = 8892^2 + 15181^2 .

It is not a de Polignac number, because 309530425 - 2¹ = 309530423 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (309530423) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 8124 + ... + 26173.

Almost surely, 2^309530425 is an apocalyptic number.

It is an amenable number.

309530425 is a deficient number, since it is larger than the sum of its proper divisors (95563253).

309530425 is a wasteful number, since it uses less digits than its factorization.

309530425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34345 (or 34321 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 31.

The square root of 309530425 is about 17593.4767740774. The cubic root of 309530425 is about 676.4480481796.

The spelling of 309530425 in words is "three hundred nine million, five hundred thirty thousand, four hundred twenty-five".