405543609 has 12 divisors (see below), whose sum is σ = 588761316. Its totient is φ = 268988832.

The previous prime is 405543601. The next prime is 405543629. The reversal of 405543609 is 906345504.

It is a happy number.

405543609 is a `hidden beast` number, since 4 + 0 + 5 + 5 + 43 + 609 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 224910009 + 180633600 = 14997^2 + 13440^2 .

It is not a de Polignac number, because 405543609 - 2³ = 405543601 is a prime.

It is not an unprimeable number, because it can be changed into a prime (405543601) 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 11 ways as a sum of consecutive naturals, for example, 112594 + ... + 116139.

It is an arithmetic number, because the mean of its divisors is an integer number (49063443).

Almost surely, 2^405543609 is an apocalyptic number.

It is an amenable number.

405543609 is a deficient number, since it is larger than the sum of its proper divisors (183217707).

405543609 is a wasteful number, since it uses less digits than its factorization.

405543609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228936 (or 228933 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The square root of 405543609 is about 20138.1133426148. The cubic root of 405543609 is about 740.1945002491.

The spelling of 405543609 in words is "four hundred five million, five hundred forty-three thousand, six hundred nine".