12978365 has 8 divisors (see below), whose sum is σ = 15615288. Its totient is φ = 10355200.

The previous prime is 12978337. The next prime is 12978373. The reversal of 12978365 is 56387921.

It can be written as a sum of positive squares in 4 ways, for example, as 2910436 + 10067929 = 1706^2 + 3173^2 .

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

It is not a de Polignac number, because 12978365 - 2²⁰ = 11929789 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 1232 + ... + 5241.

It is an arithmetic number, because the mean of its divisors is an integer number (1951911).

Almost surely, 2^12978365 is an apocalyptic number.

It is an amenable number.

12978365 is a deficient number, since it is larger than the sum of its proper divisors (2636923).

12978365 is an equidigital number, since it uses as much as digits as its factorization.

12978365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6879.

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

The square root of 12978365 is about 3602.5497914671. The cubic root of 12978365 is about 235.0029575605.

The spelling of 12978365 in words is "twelve million, nine hundred seventy-eight thousand, three hundred sixty-five".