30985725 has 12 divisors (see below), whose sum is σ = 51229856. Its totient is φ = 16525680.

The previous prime is 30985723. The next prime is 30985729. The reversal of 30985725 is 52758903.

It is not a de Polignac number, because 30985725 - 2¹ = 30985723 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30985723) 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 11 ways as a sum of consecutive naturals, for example, 206497 + ... + 206646.

Almost surely, 2^30985725 is an apocalyptic number.

It is an amenable number.

30985725 is a deficient number, since it is larger than the sum of its proper divisors (20244131).

30985725 is a wasteful number, since it uses less digits than its factorization.

30985725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 413156 (or 413151 counting only the distinct ones).

The product of its (nonzero) digits is 75600, while the sum is 39.

The square root of 30985725 is about 5566.4822823755. The cubic root of 30985725 is about 314.0898393319.

The spelling of 30985725 in words is "thirty million, nine hundred eighty-five thousand, seven hundred twenty-five".