405854609 has 2 divisors, whose sum is σ = 405854610. Its totient is φ = 405854608.

The previous prime is 405854587. The next prime is 405854621. The reversal of 405854609 is 906458504.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 393625600 + 12229009 = 19840^2 + 3497^2 .

It is a cyclic number.

It is not a de Polignac number, because 405854609 - 2¹⁶ = 405789073 is a prime.

It is not a weakly prime, because it can be changed into another prime (405854509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202927304 + 202927305.

It is an arithmetic number, because the mean of its divisors is an integer number (202927305).

Almost surely, 2^405854609 is an apocalyptic number.

It is an amenable number.

405854609 is a deficient number, since it is larger than the sum of its proper divisors (1).

405854609 is an equidigital number, since it uses as much as digits as its factorization.

405854609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 172800, while the sum is 41.

The square root of 405854609 is about 20145.8335394691. The cubic root of 405854609 is about 740.3836633582.

The spelling of 405854609 in words is "four hundred five million, eight hundred fifty-four thousand, six hundred nine".