694409 has 2 divisors, whose sum is σ = 694410. Its totient is φ = 694408.

The previous prime is 694391. The next prime is 694427. The reversal of 694409 is 904496.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (694391) and next prime (694427).

It can be written as a sum of positive squares in only one way, i.e., 511225 + 183184 = 715^2 + 428^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-694409 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 694409.

It is not a weakly prime, because it can be changed into another prime (694609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 347204 + 347205.

It is an arithmetic number, because the mean of its divisors is an integer number (347205).

2⁶⁹⁴⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

694409 is a deficient number, since it is larger than the sum of its proper divisors (1).

694409 is an equidigital number, since it uses as much as digits as its factorization.

694409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 694409 is about 833.3120663953. The cubic root of 694409 is about 88.5533741259.

The spelling of 694409 in words is "six hundred ninety-four thousand, four hundred nine".