12978635 has 8 divisors (see below), whose sum is σ = 15596496. Its totient is φ = 10368160.

The previous prime is 12978629. The next prime is 12978659. The reversal of 12978635 is 53687921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12978635 - 2⁴ = 12978619 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12978592 and 12978601.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 3365 + ... + 6105.

It is an arithmetic number, because the mean of its divisors is an integer number (1949562).

Almost surely, 2^12978635 is an apocalyptic number.

12978635 is a deficient number, since it is larger than the sum of its proper divisors (2617861).

12978635 is an equidigital number, since it uses as much as digits as its factorization.

12978635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3693.

The product of its digits is 90720, while the sum is 41.

The square root of 12978635 is about 3602.5872647307. The cubic root of 12978635 is about 235.0045872049.

The spelling of 12978635 in words is "twelve million, nine hundred seventy-eight thousand, six hundred thirty-five".