400040503 has 2 divisors, whose sum is σ = 400040504. Its totient is φ = 400040502.

The previous prime is 400040441. The next prime is 400040507. The reversal of 400040503 is 305040004.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400040503 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400040507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200020251 + 200020252.

It is an arithmetic number, because the mean of its divisors is an integer number (200020252).

Almost surely, 2^400040503 is an apocalyptic number.

400040503 is a deficient number, since it is larger than the sum of its proper divisors (1).

400040503 is an equidigital number, since it uses as much as digits as its factorization.

400040503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 16.

The square root of 400040503 is about 20001.0125493686. The cubic root of 400040503 is about 736.8311679434.

Adding to 400040503 its reverse (305040004), we get a palindrome (705080507).

The spelling of 400040503 in words is "four hundred million, forty thousand, five hundred three".