12778438 has 8 divisors (see below), whose sum is σ = 19437840. Its totient is φ = 6299160.

The previous prime is 12778433. The next prime is 12778453. The reversal of 12778438 is 83487721.

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

It is a self number, because there is not a number n which added to its sum of digits gives 12778438.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12778433) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44853 + ... + 45136.

It is an arithmetic number, because the mean of its divisors is an integer number (2429730).

Almost surely, 2^12778438 is an apocalyptic number.

12778438 is a deficient number, since it is larger than the sum of its proper divisors (6659402).

12778438 is an equidigital number, since it uses as much as digits as its factorization.

12778438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90062.

The product of its digits is 75264, while the sum is 40.

The square root of 12778438 is about 3574.6941127878. The cubic root of 12778438 is about 233.7899959204.

The spelling of 12778438 in words is "twelve million, seven hundred seventy-eight thousand, four hundred thirty-eight".