30312530 has 32 divisors (see below), whose sum is σ = 59194800. Its totient is φ = 11130880.

The previous prime is 30312493. The next prime is 30312539. The reversal of 30312530 is 3521303.

It can be written as a sum of positive squares in 8 ways, for example, as 2042041 + 28270489 = 1429^2 + 5317^2 .

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a junction number, because it is equal to n+sod(n) for n = 30312499 and 30312508.

It is not an unprimeable number, because it can be changed into a prime (30312539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4796 + ... + 9144.

Almost surely, 2^30312530 is an apocalyptic number.

30312530 is a deficient number, since it is larger than the sum of its proper divisors (28882270).

30312530 is a wasteful number, since it uses less digits than its factorization.

30312530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4414.

The product of its (nonzero) digits is 270, while the sum is 17.

The square root of 30312530 is about 5505.6816108453. The cubic root of 30312530 is about 311.7985289811.

Adding to 30312530 its reverse (3521303), we get a palindrome (33833833).

The spelling of 30312530 in words is "thirty million, three hundred twelve thousand, five hundred thirty".