716409 has 6 divisors (see below), whose sum is σ = 1034826. Its totient is φ = 477600.

The previous prime is 716399. The next prime is 716411. The reversal of 716409 is 904617.

It can be written as a sum of positive squares in only one way, i.e., 360000 + 356409 = 600^2 + 597^2 .

It is not a de Polignac number, because 716409 - 2¹¹ = 714361 is a prime.

It is not an unprimeable number, because it can be changed into a prime (716449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 39792 + ... + 39809.

It is an arithmetic number, because the mean of its divisors is an integer number (172471).

2⁷¹⁶⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

716409 is a deficient number, since it is larger than the sum of its proper divisors (318417).

716409 is a wasteful number, since it uses less digits than its factorization.

716409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79607 (or 79604 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 716409 is about 846.4094753723. The cubic root of 716409 is about 89.4788398110.

The spelling of 716409 in words is "seven hundred sixteen thousand, four hundred nine".