709409 has 2 divisors, whose sum is σ = 709410. Its totient is φ = 709408.

The previous prime is 709381. The next prime is 709417. The reversal of 709409 is 904907.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 462400 + 247009 = 680^2 + 497^2 .

It is an emirp because it is prime and its reverse (904907) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 709409 - 2⁸ = 709153 is a prime.

It is a super-2 number, since 2×709409² = 1006522258562, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (709469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 354704 + 354705.

It is an arithmetic number, because the mean of its divisors is an integer number (354705).

2⁷⁰⁹⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

709409 is a deficient number, since it is larger than the sum of its proper divisors (1).

709409 is an equidigital number, since it uses as much as digits as its factorization.

709409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 709409 is about 842.2642103283. The cubic root of 709409 is about 89.1864542027.

The spelling of 709409 in words is "seven hundred nine thousand, four hundred nine".