12778395 has 32 divisors (see below), whose sum is σ = 23569920. Its totient is φ = 5790720.

The previous prime is 12778391. The next prime is 12778399. The reversal of 12778395 is 59387721.

It is an interprime number because it is at equal distance from previous prime (12778391) and next prime (12778399).

It is not a de Polignac number, because 12778395 - 2² = 12778391 is a prime.

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 31 ways as a sum of consecutive naturals, for example, 13291 + ... + 14219.

It is an arithmetic number, because the mean of its divisors is an integer number (736560).

Almost surely, 2^12778395 is an apocalyptic number.

12778395 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12778395 is a deficient number, since it is larger than the sum of its proper divisors (10791525).

12778395 is a wasteful number, since it uses less digits than its factorization.

12778395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1075.

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

The square root of 12778395 is about 3574.6880982821. The cubic root of 12778395 is about 233.7897336823.

The spelling of 12778395 in words is "twelve million, seven hundred seventy-eight thousand, three hundred ninety-five".