408505819 has 2 divisors, whose sum is σ = 408505820. Its totient is φ = 408505818.

The previous prime is 408505781. The next prime is 408505859. The reversal of 408505819 is 918505804.

It is an a-pointer prime, because the next prime (408505859) can be obtained adding 408505819 to its sum of digits (40).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 408505819 - 2²⁵ = 374951387 is a prime.

It is a super-2 number, since 2×408505819² = 333754008313721522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (408505859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204252909 + 204252910.

It is an arithmetic number, because the mean of its divisors is an integer number (204252910).

Almost surely, 2^408505819 is an apocalyptic number.

408505819 is a deficient number, since it is larger than the sum of its proper divisors (1).

408505819 is an equidigital number, since it uses as much as digits as its factorization.

408505819 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 57600, while the sum is 40.

The square root of 408505819 is about 20211.5268844291. The cubic root of 408505819 is about 741.9923296045.

The spelling of 408505819 in words is "four hundred eight million, five hundred five thousand, eight hundred nineteen".