12978311 has 6 divisors (see below), whose sum is σ = 13697712. Its totient is φ = 12294900.

The previous prime is 12978307. The next prime is 12978313. The reversal of 12978311 is 11387921.

It is not a de Polignac number, because 12978311 - 2² = 12978307 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 (12978313) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17615 + ... + 18336.

It is an arithmetic number, because the mean of its divisors is an integer number (2282952).

Almost surely, 2^12978311 is an apocalyptic number.

12978311 is a deficient number, since it is larger than the sum of its proper divisors (719401).

12978311 is an equidigital number, since it uses as much as digits as its factorization.

12978311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35989 (or 35970 counting only the distinct ones).

The product of its digits is 3024, while the sum is 32.

The square root of 12978311 is about 3602.5422967677. The cubic root of 12978311 is about 235.0026316289.

The spelling of 12978311 in words is "twelve million, nine hundred seventy-eight thousand, three hundred eleven".