12689393 has 2 divisors, whose sum is σ = 12689394. Its totient is φ = 12689392.

The previous prime is 12689381. The next prime is 12689401. The reversal of 12689393 is 39398621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12475024 + 214369 = 3532^2 + 463^2 .

It is a cyclic number.

It is not a de Polignac number, because 12689393 - 2¹⁰ = 12688369 is a prime.

It is a super-2 number, since 2×12689393² = 322041389416898, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12689393.

It is not a weakly prime, because it can be changed into another prime (12689363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6344696 + 6344697.

It is an arithmetic number, because the mean of its divisors is an integer number (6344697).

Almost surely, 2^12689393 is an apocalyptic number.

It is an amenable number.

12689393 is a deficient number, since it is larger than the sum of its proper divisors (1).

12689393 is an equidigital number, since it uses as much as digits as its factorization.

12689393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69984, while the sum is 41.

The square root of 12689393 is about 3562.2174273899. The cubic root of 12689393 is about 233.2456838595.

The spelling of 12689393 in words is "twelve million, six hundred eighty-nine thousand, three hundred ninety-three".