12978737 has 2 divisors, whose sum is σ = 12978738. Its totient is φ = 12978736.

The previous prime is 12978731. The next prime is 12978773. The reversal of 12978737 is 73787921.

Together with next prime (12978773) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8317456 + 4661281 = 2884^2 + 2159^2 .

It is a cyclic number.

It is not a de Polignac number, because 12978737 - 2¹² = 12974641 is a prime.

It is a super-2 number, since 2×12978737² = 336895228230338, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12978731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6489368 + 6489369.

It is an arithmetic number, because the mean of its divisors is an integer number (6489369).

Almost surely, 2^12978737 is an apocalyptic number.

It is an amenable number.

12978737 is a deficient number, since it is larger than the sum of its proper divisors (1).

12978737 is an equidigital number, since it uses as much as digits as its factorization.

12978737 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 148176, while the sum is 44.

The square root of 12978737 is about 3602.6014211955. The cubic root of 12978737 is about 235.0052028424.

The spelling of 12978737 in words is "twelve million, nine hundred seventy-eight thousand, seven hundred thirty-seven".