6859409 has 2 divisors, whose sum is σ = 6859410. Its totient is φ = 6859408.

The previous prime is 6859387. The next prime is 6859417. The reversal of 6859409 is 9049586.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6553600 + 305809 = 2560^2 + 553^2 .

It is a cyclic number.

It is not a de Polignac number, because 6859409 - 2¹² = 6855313 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (6859429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3429704 + 3429705.

It is an arithmetic number, because the mean of its divisors is an integer number (3429705).

Almost surely, 2^6859409 is an apocalyptic number.

It is an amenable number.

6859409 is a deficient number, since it is larger than the sum of its proper divisors (1).

6859409 is an equidigital number, since it uses as much as digits as its factorization.

6859409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 6859409 is about 2619.0473458874. The cubic root of 6859409 is about 190.0037764716.

The spelling of 6859409 in words is "six million, eight hundred fifty-nine thousand, four hundred nine".