405296509 has 2 divisors, whose sum is σ = 405296510. Its totient is φ = 405296508.

The previous prime is 405296447. The next prime is 405296513. The reversal of 405296509 is 905692504.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 371911225 + 33385284 = 19285^2 + 5778^2 .

It is a cyclic number.

It is not a de Polignac number, because 405296509 - 2¹⁵ = 405263741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (405296519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202648254 + 202648255.

It is an arithmetic number, because the mean of its divisors is an integer number (202648255).

Almost surely, 2^405296509 is an apocalyptic number.

It is an amenable number.

405296509 is a deficient number, since it is larger than the sum of its proper divisors (1).

405296509 is an equidigital number, since it uses as much as digits as its factorization.

405296509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 97200, while the sum is 40.

The square root of 405296509 is about 20131.9772749723. The cubic root of 405296509 is about 740.0441348159.

The spelling of 405296509 in words is "four hundred five million, two hundred ninety-six thousand, five hundred nine".