12530978 has 4 divisors (see below), whose sum is σ = 18796470. Its totient is φ = 6265488.

The previous prime is 12530971. The next prime is 12530983. The reversal of 12530978 is 87903521.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 10975969 + 1555009 = 3313^2 + 1247^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12530971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3132743 + ... + 3132746.

Almost surely, 2^12530978 is an apocalyptic number.

12530978 is a deficient number, since it is larger than the sum of its proper divisors (6265492).

12530978 is an equidigital number, since it uses as much as digits as its factorization.

12530978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6265491.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 12530978 is about 3539.9121458025. The cubic root of 12530978 is about 232.2709997106.

It can be divided in two parts, 12 and 530978, that multiplied together give a palindrome (6371736).

The spelling of 12530978 in words is "twelve million, five hundred thirty thousand, nine hundred seventy-eight".