400006603 has 2 divisors, whose sum is σ = 400006604. Its totient is φ = 400006602.

The previous prime is 400006573. The next prime is 400006643. The reversal of 400006603 is 306600004.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400006603 is a prime.

It is not a weakly prime, because it can be changed into another prime (400006643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200003301 + 200003302.

It is an arithmetic number, because the mean of its divisors is an integer number (200003302).

Almost surely, 2^400006603 is an apocalyptic number.

400006603 is a deficient number, since it is larger than the sum of its proper divisors (1).

400006603 is an equidigital number, since it uses as much as digits as its factorization.

400006603 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 400006603 is about 20000.1650743188. The cubic root of 400006603 is about 736.8103539824.

Adding to 400006603 its reverse (306600004), we get a palindrome (706606607).

The spelling of 400006603 in words is "four hundred million, six thousand, six hundred three".