13400689 has 2 divisors, whose sum is σ = 13400690. Its totient is φ = 13400688.

The previous prime is 13400657. The next prime is 13400693. The reversal of 13400689 is 98600431.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6718464 + 6682225 = 2592^2 + 2585^2 .

It is a cyclic number.

It is not a de Polignac number, because 13400689 - 2⁵ = 13400657 is a prime.

It is a super-3 number, since 3×13400689³ (a number of 22 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 13400689.

It is not a weakly prime, because it can be changed into another prime (13400089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6700344 + 6700345.

It is an arithmetic number, because the mean of its divisors is an integer number (6700345).

Almost surely, 2^13400689 is an apocalyptic number.

It is an amenable number.

13400689 is a deficient number, since it is larger than the sum of its proper divisors (1).

13400689 is an equidigital number, since it uses as much as digits as its factorization.

13400689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 13400689 is about 3660.6951525632. The cubic root of 13400689 is about 237.5248446770.

The spelling of 13400689 in words is "thirteen million, four hundred thousand, six hundred eighty-nine".