12977278 has 4 divisors (see below), whose sum is σ = 19465920. Its totient is φ = 6488638.

The previous prime is 12977243. The next prime is 12977287. The reversal of 12977278 is 87277921.

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: 87277921 = 571 ⋅152851.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3244318 + ... + 3244321.

It is an arithmetic number, because the mean of its divisors is an integer number (4866480).

Almost surely, 2^12977278 is an apocalyptic number.

12977278 is a deficient number, since it is larger than the sum of its proper divisors (6488642).

12977278 is an equidigital number, since it uses as much as digits as its factorization.

12977278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6488641.

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

The square root of 12977278 is about 3602.3989229401. The cubic root of 12977278 is about 234.9963965043.

The spelling of 12977278 in words is "twelve million, nine hundred seventy-seven thousand, two hundred seventy-eight".