705409 has 2 divisors, whose sum is σ = 705410.
Its totient is φ = 705408.
The previous prime is 705403. The next prime is 705421. The reversal of 705409 is 904507.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 378225 + 327184 = 615^2 + 572^2
It is a cyclic number.
It is not a de Polignac number, because 705409 - 29 = 704897 is a prime.
It is not a weakly prime, because it can be changed into another prime (705403) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 352704 + 352705.
It is an arithmetic number, because the mean of its divisors is an integer number (352705).
2705409 is an apocalyptic number.
It is an amenable number.
705409 is a deficient number, since it is larger than the sum of its proper divisors (1).
705409 is an equidigital number, since it uses as much as digits as its factorization.
705409 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 1260, while the sum is 25.
The square root of 705409 is about 839.8863018290.
The cubic root of 705409 is about 89.0185123297.
The spelling of 705409 in words is "seven hundred five thousand, four hundred nine".