400530565 has 4 divisors (see below), whose sum is σ = 480636684. Its totient is φ = 320424448.

The previous prime is 400530563. The next prime is 400530589. The reversal of 400530565 is 565035004.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 100340289 + 300190276 = 10017^2 + 17326^2 .

It is a cyclic number.

It is not a de Polignac number, because 400530565 - 2¹ = 400530563 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400530563) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40053052 + ... + 40053061.

It is an arithmetic number, because the mean of its divisors is an integer number (120159171).

Almost surely, 2^400530565 is an apocalyptic number.

It is an amenable number.

400530565 is a deficient number, since it is larger than the sum of its proper divisors (80106119).

400530565 is an equidigital number, since it uses as much as digits as its factorization.

400530565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80106118.

The product of its (nonzero) digits is 9000, while the sum is 28.

The square root of 400530565 is about 20013.2597294893. The cubic root of 400530565 is about 737.1319254945.

Adding to 400530565 its reverse (565035004), we get a palindrome (965565569).

It can be divided in two parts, 400 and 530565, that added together give a triangular number (530965 = T₁₀₃₀).

The spelling of 400530565 in words is "four hundred million, five hundred thirty thousand, five hundred sixty-five".