400543403 has 4 divisors (see below), whose sum is σ = 431354448. Its totient is φ = 369732360.

The previous prime is 400543399. The next prime is 400543411. The reversal of 400543403 is 304345004.

It is a happy number.

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 400543403 - 2² = 400543399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400543483) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15405503 + ... + 15405528.

It is an arithmetic number, because the mean of its divisors is an integer number (107838612).

Almost surely, 2^400543403 is an apocalyptic number.

400543403 is a deficient number, since it is larger than the sum of its proper divisors (30811045).

400543403 is a wasteful number, since it uses less digits than its factorization.

400543403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30811044.

The product of its (nonzero) digits is 2880, while the sum is 23.

The square root of 400543403 is about 20013.5804642748. The cubic root of 400543403 is about 737.1398010470.

Adding to 400543403 its reverse (304345004), we get a palindrome (704888407).

The spelling of 400543403 in words is "four hundred million, five hundred forty-three thousand, four hundred three".