1408646689 has 2 divisors, whose sum is σ = 1408646690. Its totient is φ = 1408646688.

The previous prime is 1408646677. The next prime is 1408646693. The reversal of 1408646689 is 9866468041.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1392782400 + 15864289 = 37320^2 + 3983^2 .

It is a cyclic number.

It is not a de Polignac number, because 1408646689 - 2¹⁷ = 1408515617 is a prime.

It is not a weakly prime, because it can be changed into another prime (1408644689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 704323344 + 704323345.

It is an arithmetic number, because the mean of its divisors is an integer number (704323345).

Almost surely, 2^1408646689 is an apocalyptic number.

It is an amenable number.

1408646689 is a deficient number, since it is larger than the sum of its proper divisors (1).

1408646689 is an equidigital number, since it uses as much as digits as its factorization.

1408646689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1990656, while the sum is 52.

The square root of 1408646689 is about 37531.9422492362. The cubic root of 1408646689 is about 1120.9873014536.

The spelling of 1408646689 in words is "one billion, four hundred eight million, six hundred forty-six thousand, six hundred eighty-nine".