12978607 has 4 divisors (see below), whose sum is σ = 12991536. Its totient is φ = 12965680.

The previous prime is 12978593. The next prime is 12978611. The reversal of 12978607 is 70687921.

12978607 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 12978607 - 2²³ = 4589999 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12978607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12978617) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4819 + ... + 7012.

It is an arithmetic number, because the mean of its divisors is an integer number (3247884).

Almost surely, 2^12978607 is an apocalyptic number.

12978607 is a deficient number, since it is larger than the sum of its proper divisors (12929).

12978607 is a wasteful number, since it uses less digits than its factorization.

12978607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12928.

The product of its (nonzero) digits is 42336, while the sum is 40.

The square root of 12978607 is about 3602.5833786326. The cubic root of 12978607 is about 235.0044182058.

The spelling of 12978607 in words is "twelve million, nine hundred seventy-eight thousand, six hundred seven".