408412021 has 2 divisors, whose sum is σ = 408412022. Its totient is φ = 408412020.

The previous prime is 408412013. The next prime is 408412033. The reversal of 408412021 is 120214804.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 394618225 + 13793796 = 19865^2 + 3714^2 .

It is a cyclic number.

It is not a de Polignac number, because 408412021 - 2³ = 408412013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 408411983 and 408412001.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (408412051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204206010 + 204206011.

It is an arithmetic number, because the mean of its divisors is an integer number (204206011).

Almost surely, 2^408412021 is an apocalyptic number.

It is an amenable number.

408412021 is a deficient number, since it is larger than the sum of its proper divisors (1).

408412021 is an equidigital number, since it uses as much as digits as its factorization.

408412021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 512, while the sum is 22.

The square root of 408412021 is about 20209.2063426548. The cubic root of 408412021 is about 741.9355350450.

Adding to 408412021 its reverse (120214804), we get a palindrome (528626825).

The spelling of 408412021 in words is "four hundred eight million, four hundred twelve thousand, twenty-one".