408321869 has 2 divisors, whose sum is σ = 408321870. Its totient is φ = 408321868.

The previous prime is 408321841. The next prime is 408321871. The reversal of 408321869 is 968123804.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 315488644 + 92833225 = 17762^2 + 9635^2 .

It is a cyclic number.

It is not a de Polignac number, because 408321869 - 2¹² = 408317773 is a prime.

It is a super-4 number, since 4×408321869⁴ (a number of 36 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

Together with 408321871, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (408321839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204160934 + 204160935.

It is an arithmetic number, because the mean of its divisors is an integer number (204160935).

Almost surely, 2^408321869 is an apocalyptic number.

It is an amenable number.

408321869 is a deficient number, since it is larger than the sum of its proper divisors (1).

408321869 is an equidigital number, since it uses as much as digits as its factorization.

408321869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82944, while the sum is 41.

The square root of 408321869 is about 20206.9757509628. The cubic root of 408321869 is about 741.8809399376.

It can be divided in two parts, 4083 and 21869, that added together give a palindrome (25952).

The spelling of 408321869 in words is "four hundred eight million, three hundred twenty-one thousand, eight hundred sixty-nine".