12978277 has 4 divisors (see below), whose sum is σ = 13976620. Its totient is φ = 11979936.

The previous prime is 12978239. The next prime is 12978307. The reversal of 12978277 is 77287921.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77287921 = 761 ⋅101561.

It can be written as a sum of positive squares in 2 ways, for example, as 5410276 + 7568001 = 2326^2 + 2751^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12978277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12978227) 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, 499152 + ... + 499177.

It is an arithmetic number, because the mean of its divisors is an integer number (3494155).

Almost surely, 2^12978277 is an apocalyptic number.

It is an amenable number.

12978277 is a deficient number, since it is larger than the sum of its proper divisors (998343).

12978277 is an equidigital number, since it uses as much as digits as its factorization.

12978277 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 998342.

The product of its digits is 98784, while the sum is 43.

The square root of 12978277 is about 3602.5375778748. The cubic root of 12978277 is about 235.0024264122.

The spelling of 12978277 in words is "twelve million, nine hundred seventy-eight thousand, two hundred seventy-seven".