400043607865 has 16 divisors (see below), whose sum is σ = 524839420800. Its totient is φ = 290304155520.

The previous prime is 400043607833. The next prime is 400043607893. The reversal of 400043607865 is 568706340004.

It is not a de Polignac number, because 400043607865 - 2⁵ = 400043607833 is a prime.

It is an unprimeable number.

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, 7932765 + ... + 7983034.

It is an arithmetic number, because the mean of its divisors is an integer number (32802463800).

Almost surely, 2^400043607865 is an apocalyptic number.

It is an amenable number.

400043607865 is a deficient number, since it is larger than the sum of its proper divisors (124795812935).

400043607865 is a wasteful number, since it uses less digits than its factorization.

400043607865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15916272.

The product of its (nonzero) digits is 483840, while the sum is 43.

Adding to 400043607865 its reverse (568706340004), we get a palindrome (968749947869).

The spelling of 400043607865 in words is "four hundred billion, forty-three million, six hundred seven thousand, eight hundred sixty-five".