12778539 has 8 divisors (see below), whose sum is σ = 17056320. Its totient is φ = 8509896.

The previous prime is 12778537. The next prime is 12778553. The reversal of 12778539 is 93587721.

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

It is not a de Polignac number, because 12778539 - 2¹ = 12778537 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12778539.

It is not an unprimeable number, because it can be changed into a prime (12778537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2292 + ... + 5550.

It is an arithmetic number, because the mean of its divisors is an integer number (2132040).

Almost surely, 2^12778539 is an apocalyptic number.

12778539 is a deficient number, since it is larger than the sum of its proper divisors (4277781).

12778539 is a wasteful number, since it uses less digits than its factorization.

12778539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4569.

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

The square root of 12778539 is about 3574.7082398428. The cubic root of 12778539 is about 233.7906118728.

The spelling of 12778539 in words is "twelve million, seven hundred seventy-eight thousand, five hundred thirty-nine".