400040443 has 4 divisors (see below), whose sum is σ = 436407768. Its totient is φ = 363673120.

The previous prime is 400040441. The next prime is 400040503. The reversal of 400040443 is 344040004.

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

It is a cyclic number.

It is not a de Polignac number, because 400040443 - 2¹ = 400040441 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 400040443.

It is not an unprimeable number, because it can be changed into a prime (400040441) 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, 18183646 + ... + 18183667.

It is an arithmetic number, because the mean of its divisors is an integer number (109101942).

Almost surely, 2^400040443 is an apocalyptic number.

400040443 is a deficient number, since it is larger than the sum of its proper divisors (36367325).

400040443 is a wasteful number, since it uses less digits than its factorization.

400040443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36367324.

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

The square root of 400040443 is about 20001.0110494445. The cubic root of 400040443 is about 736.8311311055.

Adding to 400040443 its reverse (344040004), we get a palindrome (744080447).

The spelling of 400040443 in words is "four hundred million, forty thousand, four hundred forty-three".