12689993 has 2 divisors, whose sum is σ = 12689994. Its totient is φ = 12689992.

The previous prime is 12689987. The next prime is 12690011. The reversal of 12689993 is 39998621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12054784 + 635209 = 3472^2 + 797^2 .

It is a cyclic number.

It is not a de Polignac number, because 12689993 - 2⁴ = 12689977 is a prime.

It is a super-2 number, since 2×12689993² = 322071844680098, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12689923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6344996 + 6344997.

It is an arithmetic number, because the mean of its divisors is an integer number (6344997).

Almost surely, 2^12689993 is an apocalyptic number.

It is an amenable number.

12689993 is a deficient number, since it is larger than the sum of its proper divisors (1).

12689993 is an equidigital number, since it uses as much as digits as its factorization.

12689993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 209952, while the sum is 47.

The square root of 12689993 is about 3562.3016436007. The cubic root of 12689993 is about 233.2493600323.

The spelling of 12689993 in words is "twelve million, six hundred eighty-nine thousand, nine hundred ninety-three".