408238819 has 2 divisors, whose sum is σ = 408238820. Its totient is φ = 408238818.

The previous prime is 408238813. The next prime is 408238847. The reversal of 408238819 is 918832804.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 408238819 - 2¹⁷ = 408107747 is a prime.

It is a super-2 number, since 2×408238819² = 333317866677029522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (408238813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204119409 + 204119410.

It is an arithmetic number, because the mean of its divisors is an integer number (204119410).

Almost surely, 2^408238819 is an apocalyptic number.

408238819 is a deficient number, since it is larger than the sum of its proper divisors (1).

408238819 is an equidigital number, since it uses as much as digits as its factorization.

408238819 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 110592, while the sum is 43.

The square root of 408238819 is about 20204.9206630464. The cubic root of 408238819 is about 741.8306386154.

The spelling of 408238819 in words is "four hundred eight million, two hundred thirty-eight thousand, eight hundred nineteen".