12689401 has 2 divisors, whose sum is σ = 12689402. Its totient is φ = 12689400.

The previous prime is 12689393. The next prime is 12689423. The reversal of 12689401 is 10498621.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10394176 + 2295225 = 3224^2 + 1515^2 .

It is a cyclic number.

It is not a de Polignac number, because 12689401 - 2³ = 12689393 is a prime.

It is a super-2 number, since 2×12689401² = 322041795477602, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12680401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6344700 + 6344701.

It is an arithmetic number, because the mean of its divisors is an integer number (6344701).

Almost surely, 2^12689401 is an apocalyptic number.

It is an amenable number.

12689401 is a deficient number, since it is larger than the sum of its proper divisors (1).

12689401 is an equidigital number, since it uses as much as digits as its factorization.

12689401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 12689401 is about 3562.2185502858. The cubic root of 12689401 is about 233.2457328759.

The spelling of 12689401 in words is "twelve million, six hundred eighty-nine thousand, four hundred one".