12978213 has 4 divisors (see below), whose sum is σ = 17304288. Its totient is φ = 8652140.

The previous prime is 12978211. The next prime is 12978227. The reversal of 12978213 is 31287921.

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.

It is a cyclic number.

It is not a de Polignac number, because 12978213 - 2¹ = 12978211 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12978211) 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, 2163033 + ... + 2163038.

It is an arithmetic number, because the mean of its divisors is an integer number (4326072).

Almost surely, 2^12978213 is an apocalyptic number.

It is an amenable number.

12978213 is a deficient number, since it is larger than the sum of its proper divisors (4326075).

12978213 is an equidigital number, since it uses as much as digits as its factorization.

12978213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4326074.

The product of its digits is 6048, while the sum is 33.

The square root of 12978213 is about 3602.5286952362. The cubic root of 12978213 is about 235.0020401211.

It can be divided in two parts, 129782 and 13, that added together give a triangular number (129795 = T₅₀₉).

The spelling of 12978213 in words is "twelve million, nine hundred seventy-eight thousand, two hundred thirteen".