12978735 has 64 divisors (see below), whose sum is σ = 27454464. Its totient is φ = 5068800.

The previous prime is 12978731. The next prime is 12978737. The reversal of 12978735 is 53787921.

12978735 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12978735 - 2² = 12978731 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12978731) 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 63 ways as a sum of consecutive naturals, for example, 19305 + ... + 19965.

It is an arithmetic number, because the mean of its divisors is an integer number (428976).

Almost surely, 2^12978735 is an apocalyptic number.

12978735 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12978735 is an abundant number, since it is smaller than the sum of its proper divisors (14475729).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12978735 is a wasteful number, since it uses less digits than its factorization.

12978735 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 704.

The product of its digits is 105840, while the sum is 42.

The square root of 12978735 is about 3602.6011436183. The cubic root of 12978735 is about 235.0051907711.

The spelling of 12978735 in words is "twelve million, nine hundred seventy-eight thousand, seven hundred thirty-five".