6985409 has 2 divisors, whose sum is σ = 6985410. Its totient is φ = 6985408.

The previous prime is 6985403. The next prime is 6985421. The reversal of 6985409 is 9045896.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6225025 + 760384 = 2495^2 + 872^2 .

It is a cyclic number.

It is not a de Polignac number, because 6985409 - 2¹² = 6981313 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6985403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3492704 + 3492705.

It is an arithmetic number, because the mean of its divisors is an integer number (3492705).

Almost surely, 2^6985409 is an apocalyptic number.

It is an amenable number.

6985409 is a deficient number, since it is larger than the sum of its proper divisors (1).

6985409 is an equidigital number, since it uses as much as digits as its factorization.

6985409 is an odious number, because the sum of its binary digits is odd.

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

The square root of 6985409 is about 2642.9924328306. The cubic root of 6985409 is about 191.1601135410.

The spelling of 6985409 in words is "six million, nine hundred eighty-five thousand, four hundred nine".