12978257 has 4 divisors (see below), whose sum is σ = 13080576. Its totient is φ = 12875940.

The previous prime is 12978239. The next prime is 12978307. The reversal of 12978257 is 75287921.

12978257 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 a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75287921 = 1949 ⋅38629.

It is a cyclic number.

It is not a de Polignac number, because 12978257 - 2¹⁰ = 12977233 is a prime.

It is a Duffinian 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, 50969 + ... + 51222.

It is an arithmetic number, because the mean of its divisors is an integer number (3270144).

Almost surely, 2^12978257 is an apocalyptic number.

It is an amenable number.

12978257 is a deficient number, since it is larger than the sum of its proper divisors (102319).

12978257 is a wasteful number, since it uses less digits than its factorization.

12978257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102318.

The product of its digits is 70560, while the sum is 41.

The square root of 12978257 is about 3602.5348020526. The cubic root of 12978257 is about 235.0023056964.

The spelling of 12978257 in words is "twelve million, nine hundred seventy-eight thousand, two hundred fifty-seven".