400570409 has 2 divisors, whose sum is σ = 400570410. Its totient is φ = 400570408.

The previous prime is 400570403. The next prime is 400570441. The reversal of 400570409 is 904075004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 231648400 + 168922009 = 15220^2 + 12997^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400570409 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (400570403) 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 as a sum of consecutive naturals, namely, 200285204 + 200285205.

It is an arithmetic number, because the mean of its divisors is an integer number (200285205).

Almost surely, 2^400570409 is an apocalyptic number.

It is an amenable number.

400570409 is a deficient number, since it is larger than the sum of its proper divisors (1).

400570409 is an equidigital number, since it uses as much as digits as its factorization.

400570409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 400570409 is about 20014.2551447712. The cubic root of 400570409 is about 737.1563674998.

The spelling of 400570409 in words is "four hundred million, five hundred seventy thousand, four hundred nine".