408405497 has 2 divisors, whose sum is σ = 408405498. Its totient is φ = 408405496.

The previous prime is 408405449. The next prime is 408405499. The reversal of 408405497 is 794504804.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 251254201 + 157151296 = 15851^2 + 12536^2 .

It is a cyclic number.

It is not a de Polignac number, because 408405497 - 2¹⁶ = 408339961 is a prime.

Together with 408405499, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (408405499) 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, 204202748 + 204202749.

It is an arithmetic number, because the mean of its divisors is an integer number (204202749).

Almost surely, 2^408405497 is an apocalyptic number.

It is an amenable number.

408405497 is a deficient number, since it is larger than the sum of its proper divisors (1).

408405497 is an equidigital number, since it uses as much as digits as its factorization.

408405497 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 161280, while the sum is 41.

The square root of 408405497 is about 20209.0449304266. The cubic root of 408405497 is about 741.9315844486.

The spelling of 408405497 in words is "four hundred eight million, four hundred five thousand, four hundred ninety-seven".