30905825 has 6 divisors (see below), whose sum is σ = 38323254. Its totient is φ = 24724640.

The previous prime is 30905821. The next prime is 30905843. The reversal of 30905825 is 52850903.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 512656 + 30393169 = 716^2 + 5513^2 .

It is not a de Polignac number, because 30905825 - 2² = 30905821 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30905791 and 30905800.

It is not an unprimeable number, because it can be changed into a prime (30905821) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 618092 + ... + 618141.

It is an arithmetic number, because the mean of its divisors is an integer number (6387209).

Almost surely, 2^30905825 is an apocalyptic number.

It is an amenable number.

30905825 is a deficient number, since it is larger than the sum of its proper divisors (7417429).

30905825 is a wasteful number, since it uses less digits than its factorization.

30905825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1236243 (or 1236238 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 30905825 is about 5559.3007653841. The cubic root of 30905825 is about 313.8196355544.

The spelling of 30905825 in words is "thirty million, nine hundred five thousand, eight hundred twenty-five".