12978523 has 4 divisors (see below), whose sum is σ = 12989200. Its totient is φ = 12967848.

The previous prime is 12978517. The next prime is 12978529. The reversal of 12978523 is 32587921.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (12978517) and next prime (12978529).

It is a cyclic number.

It is not a de Polignac number, because 12978523 - 2²¹ = 10881371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12978529) 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 3 ways as a sum of consecutive naturals, for example, 3240 + ... + 6037.

It is an arithmetic number, because the mean of its divisors is an integer number (3247300).

Almost surely, 2^12978523 is an apocalyptic number.

12978523 is a deficient number, since it is larger than the sum of its proper divisors (10677).

12978523 is an equidigital number, since it uses as much as digits as its factorization.

12978523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10676.

The product of its digits is 30240, while the sum is 37.

The square root of 12978523 is about 3602.5717203131. The cubic root of 12978523 is about 235.0039112070.

The spelling of 12978523 in words is "twelve million, nine hundred seventy-eight thousand, five hundred twenty-three".