396509 has 2 divisors, whose sum is σ = 396510. Its totient is φ = 396508.

The previous prime is 396479. The next prime is 396523. The reversal of 396509 is 905693.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 319225 + 77284 = 565^2 + 278^2 .

It is an emirp because it is prime and its reverse (905693) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-396509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (396709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198254 + 198255.

It is an arithmetic number, because the mean of its divisors is an integer number (198255).

2³⁹⁶⁵⁰⁹ is an apocalyptic number.

It is an amenable number.

396509 is a deficient number, since it is larger than the sum of its proper divisors (1).

396509 is an equidigital number, since it uses as much as digits as its factorization.

396509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7290, while the sum is 32.

The square root of 396509 is about 629.6896060759. The cubic root of 396509 is about 73.4656541213.

The spelling of 396509 in words is "three hundred ninety-six thousand, five hundred nine".