12638977 has 4 divisors (see below), whose sum is σ = 13611220. Its totient is φ = 11666736.

The previous prime is 12638957. The next prime is 12638987. The reversal of 12638977 is 77983621.

It is a happy number.

12638977 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77983621 = 409 ⋅190669.

It can be written as a sum of positive squares in 2 ways, for example, as 6533136 + 6105841 = 2556^2 + 2471^2 .

It is a cyclic number.

It is not a de Polignac number, because 12638977 - 2⁷ = 12638849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12638957) 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, 486102 + ... + 486127.

It is an arithmetic number, because the mean of its divisors is an integer number (3402805).

Almost surely, 2^12638977 is an apocalyptic number.

It is an amenable number.

12638977 is a deficient number, since it is larger than the sum of its proper divisors (972243).

12638977 is an equidigital number, since it uses as much as digits as its factorization.

12638977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 972242.

The product of its digits is 127008, while the sum is 43.

The square root of 12638977 is about 3555.1338933998. The cubic root of 12638977 is about 232.9363724412.

The spelling of 12638977 in words is "twelve million, six hundred thirty-eight thousand, nine hundred seventy-seven".