406603321 has 2 divisors, whose sum is σ = 406603322. Its totient is φ = 406603320.

The previous prime is 406603303. The next prime is 406603343. The reversal of 406603321 is 123306604.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 279725625 + 126877696 = 16725^2 + 11264^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-406603321 is a prime.

It is not a weakly prime, because it can be changed into another prime (406603381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203301660 + 203301661.

It is an arithmetic number, because the mean of its divisors is an integer number (203301661).

Almost surely, 2^406603321 is an apocalyptic number.

It is an amenable number.

406603321 is a deficient number, since it is larger than the sum of its proper divisors (1).

406603321 is an equidigital number, since it uses as much as digits as its factorization.

406603321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 406603321 is about 20164.4072811476. The cubic root of 406603321 is about 740.8386650554.

Adding to 406603321 its reverse (123306604), we get a palindrome (529909925).

The spelling of 406603321 in words is "four hundred six million, six hundred three thousand, three hundred twenty-one".