400043705 has 4 divisors (see below), whose sum is σ = 480052452. Its totient is φ = 320034960.

The previous prime is 400043701. The next prime is 400043731. The reversal of 400043705 is 507340004.

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 180203776 + 219839929 = 13424^2 + 14827^2 .

It is not a de Polignac number, because 400043705 - 2² = 400043701 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (400043701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40004366 + ... + 40004375.

It is an arithmetic number, because the mean of its divisors is an integer number (120013113).

Almost surely, 2^400043705 is an apocalyptic number.

It is an amenable number.

400043705 is a deficient number, since it is larger than the sum of its proper divisors (80008747).

400043705 is an equidigital number, since it uses as much as digits as its factorization.

400043705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80008746.

The product of its (nonzero) digits is 1680, while the sum is 23.

The square root of 400043705 is about 20001.0925951559. The cubic root of 400043705 is about 736.8331338502.

Adding to 400043705 its reverse (507340004), we get a palindrome (907383709).

The spelling of 400043705 in words is "four hundred million, forty-three thousand, seven hundred five".