12784138 has 8 divisors (see below), whose sum is σ = 19391940. Its totient is φ = 6320160.

The previous prime is 12784133. The next prime is 12784139. The reversal of 12784138 is 83148721.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 9223369 + 3560769 = 3037^2 + 1887^2 .

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

It is not an unprimeable number, because it can be changed into a prime (12784133) 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, 35733 + ... + 36088.

Almost surely, 2^12784138 is an apocalyptic number.

12784138 is a deficient number, since it is larger than the sum of its proper divisors (6607802).

12784138 is an equidigital number, since it uses as much as digits as its factorization.

12784138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71912.

The product of its digits is 10752, while the sum is 34.

The square root of 12784138 is about 3575.4912949132. The cubic root of 12784138 is about 233.8247525129.

The spelling of 12784138 in words is "twelve million, seven hundred eighty-four thousand, one hundred thirty-eight".