403912321 has 2 divisors, whose sum is σ = 403912322. Its totient is φ = 403912320.

The previous prime is 403912307. The next prime is 403912331. The reversal of 403912321 is 123219304.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 312900721 + 91011600 = 17689^2 + 9540^2 .

It is a cyclic number.

It is not a de Polignac number, because 403912321 - 2⁷ = 403912193 is a prime.

It is not a weakly prime, because it can be changed into another prime (403912331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201956160 + 201956161.

It is an arithmetic number, because the mean of its divisors is an integer number (201956161).

Almost surely, 2^403912321 is an apocalyptic number.

It is an amenable number.

403912321 is a deficient number, since it is larger than the sum of its proper divisors (1).

403912321 is an equidigital number, since it uses as much as digits as its factorization.

403912321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 403912321 is about 20097.5700272446. The cubic root of 403912321 is about 739.2006958737.

The spelling of 403912321 in words is "four hundred three million, nine hundred twelve thousand, three hundred twenty-one".