400044043 has 4 divisors (see below), whose sum is σ = 457193200. Its totient is φ = 342894888.

The previous prime is 400044041. The next prime is 400044079. The reversal of 400044043 is 340440004.

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

It is not a de Polignac number, because 400044043 - 2¹ = 400044041 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 400044043.

It is not an unprimeable number, because it can be changed into a prime (400044041) 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 in 3 ways as a sum of consecutive naturals, for example, 28574568 + ... + 28574581.

It is an arithmetic number, because the mean of its divisors is an integer number (114298300).

Almost surely, 2^400044043 is an apocalyptic number.

400044043 is a deficient number, since it is larger than the sum of its proper divisors (57149157).

400044043 is an equidigital number, since it uses as much as digits as its factorization.

400044043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57149156.

The product of its (nonzero) digits is 768, while the sum is 19.

The square root of 400044043 is about 20001.1010446925. The cubic root of 400044043 is about 736.8333413688.

Adding to 400044043 its reverse (340440004), we get a palindrome (740484047).

The spelling of 400044043 in words is "four hundred million, forty-four thousand, forty-three".