30027905 has 24 divisors (see below), whose sum is σ = 38526072. Its totient is φ = 22450176.

The previous prime is 30027901. The next prime is 30027911. The reversal of 30027905 is 50972003.

It can be written as a sum of positive squares in 12 ways, for example, as 3474496 + 26553409 = 1864^2 + 5153^2 .

It is not a de Polignac number, because 30027905 - 2² = 30027901 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (30027901) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 155489 + ... + 155681.

It is an arithmetic number, because the mean of its divisors is an integer number (1605253).

Almost surely, 2^30027905 is an apocalyptic number.

It is an amenable number.

30027905 is a deficient number, since it is larger than the sum of its proper divisors (8498167).

30027905 is a wasteful number, since it uses less digits than its factorization.

30027905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293 (or 264 counting only the distinct ones).

The product of its (nonzero) digits is 1890, while the sum is 26.

The square root of 30027905 is about 5479.7723492861. The cubic root of 30027905 is about 310.8195622097.

Adding to 30027905 its reverse (50972003), we get a palindrome (80999908).

The spelling of 30027905 in words is "thirty million, twenty-seven thousand, nine hundred five".