400005443 has 8 divisors (see below), whose sum is σ = 420403200. Its totient is φ = 379858248.

The previous prime is 400005407. The next prime is 400005449. The reversal of 400005443 is 344500004.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 400005443 - 2¹⁰ = 400004419 is a prime.

It is not an unprimeable number, because it can be changed into a prime (400005449) 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 7 ways as a sum of consecutive naturals, for example, 59363 + ... + 65756.

It is an arithmetic number, because the mean of its divisors is an integer number (52550400).

Almost surely, 2^400005443 is an apocalyptic number.

400005443 is a deficient number, since it is larger than the sum of its proper divisors (20397757).

400005443 is a wasteful number, since it uses less digits than its factorization.

400005443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125281.

The product of its (nonzero) digits is 960, while the sum is 20.

The square root of 400005443 is about 20000.1360745371. The cubic root of 400005443 is about 736.8096417435.

Adding to 400005443 its reverse (344500004), we get a palindrome (744505447).

The spelling of 400005443 in words is "four hundred million, five thousand, four hundred forty-three".