1406689 has 2 divisors, whose sum is σ = 1406690.
Its totient is φ = 1406688.
The previous prime is 1406683. The next prime is 1406701. The reversal of 1406689 is 9866041.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 1016064 + 390625 = 1008^2 + 625^2
It is an emirp because it is prime and its reverse (9866041) is a distict prime.
It is a cyclic number.
It is not a de Polignac number, because 1406689 - 213 = 1398497 is a prime.
It is not a weakly prime, because it can be changed into another prime (1406683) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 703344 + 703345.
It is an arithmetic number, because the mean of its divisors is an integer number (703345).
21406689 is an apocalyptic number.
It is an amenable number.
1406689 is a deficient number, since it is larger than the sum of its proper divisors (1).
1406689 is an equidigital number, since it uses as much as digits as its factorization.
1406689 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 10368, while the sum is 34.
The square root of 1406689 is about 1186.0392067719.
The cubic root of 1406689 is about 112.0467757424.
The spelling of 1406689 in words is "one million, four hundred six thousand, six hundred eighty-nine".