12978747 has 12 divisors (see below), whose sum is σ = 19393920. Its totient is φ = 8353968.

The previous prime is 12978737. The next prime is 12978773. The reversal of 12978747 is 74787921.

It is a happy number.

It is not a de Polignac number, because 12978747 - 2⁴ = 12978731 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12978727) 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 11 ways as a sum of consecutive naturals, for example, 24603 + ... + 25124.

It is an arithmetic number, because the mean of its divisors is an integer number (1616160).

Almost surely, 2^12978747 is an apocalyptic number.

12978747 is a deficient number, since it is larger than the sum of its proper divisors (6415173).

12978747 is a wasteful number, since it uses less digits than its factorization.

12978747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49762 (or 49759 counting only the distinct ones).

The product of its digits is 197568, while the sum is 45.

The square root of 12978747 is about 3602.6028090812. The cubic root of 12978747 is about 235.0052631989.

The spelling of 12978747 in words is "twelve million, nine hundred seventy-eight thousand, seven hundred forty-seven".