12778393 has 8 divisors (see below), whose sum is σ = 13488320. Its totient is φ = 12072240.

The previous prime is 12778391. The next prime is 12778399. The reversal of 12778393 is 39387721.

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

It is a cyclic number.

It is not a de Polignac number, because 12778393 - 2¹ = 12778391 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12778391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8563 + ... + 9943.

It is an arithmetic number, because the mean of its divisors is an integer number (1686040).

Almost surely, 2^12778393 is an apocalyptic number.

It is an amenable number.

12778393 is a deficient number, since it is larger than the sum of its proper divisors (709927).

12778393 is a wasteful number, since it uses less digits than its factorization.

12778393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1887.

The product of its digits is 63504, while the sum is 40.

The square root of 12778393 is about 3574.6878185374. The cubic root of 12778393 is about 233.7897214852.

The spelling of 12778393 in words is "twelve million, seven hundred seventy-eight thousand, three hundred ninety-three".