400530609 has 16 divisors (see below), whose sum is σ = 597025600. Its totient is φ = 265379328.

The previous prime is 400530607. The next prime is 400530617. The reversal of 400530609 is 906035004.

It is a happy number.

400530609 is a `hidden beast` number, since 4 + 0 + 0 + 53 + 0 + 609 = 666.

It is not a de Polignac number, because 400530609 - 2¹ = 400530607 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400530601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41104 + ... + 49905.

It is an arithmetic number, because the mean of its divisors is an integer number (37314100).

Almost surely, 2^400530609 is an apocalyptic number.

It is an amenable number.

400530609 is a deficient number, since it is larger than the sum of its proper divisors (196494991).

400530609 is a wasteful number, since it uses less digits than its factorization.

400530609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91181 (or 91175 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 400530609 is about 20013.2608287605. The cubic root of 400530609 is about 737.1319524868.

The spelling of 400530609 in words is "four hundred million, five hundred thirty thousand, six hundred nine".