12778392 has 64 divisors (see below), whose sum is σ = 35280000. Its totient is φ = 3824640.

The previous prime is 12778391. The next prime is 12778399. The reversal of 12778392 is 29387721.

It is a self number, because there is not a number n which added to its sum of digits gives 12778392.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12778391) 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 15 ways as a sum of consecutive naturals, for example, 25359 + ... + 25857.

It is an arithmetic number, because the mean of its divisors is an integer number (551250).

Almost surely, 2^12778392 is an apocalyptic number.

12778392 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12778392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17640000).

12778392 is an abundant number, since it is smaller than the sum of its proper divisors (22501608).

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

12778392 is a wasteful number, since it uses less digits than its factorization.

12778392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 616 (or 612 counting only the distinct ones).

The product of its digits is 42336, while the sum is 39.

The square root of 12778392 is about 3574.6876786651. The cubic root of 12778392 is about 233.7897153866.

It can be divided in two parts, 1277 and 8392, that added together give a palindrome (9669).

The spelling of 12778392 in words is "twelve million, seven hundred seventy-eight thousand, three hundred ninety-two".