408238865 has 4 divisors (see below), whose sum is σ = 489886644. Its totient is φ = 326591088.

The previous prime is 408238847. The next prime is 408238933. The reversal of 408238865 is 568832804.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 143233024 + 265005841 = 11968^2 + 16279^2 .

It is a cyclic number.

It is not a de Polignac number, because 408238865 - 2⁶ = 408238801 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40823882 + ... + 40823891.

It is an arithmetic number, because the mean of its divisors is an integer number (122471661).

Almost surely, 2^408238865 is an apocalyptic number.

It is an amenable number.

408238865 is a deficient number, since it is larger than the sum of its proper divisors (81647779).

408238865 is an equidigital number, since it uses as much as digits as its factorization.

408238865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81647778.

The product of its (nonzero) digits is 368640, while the sum is 44.

The square root of 408238865 is about 20204.9218013829. The cubic root of 408238865 is about 741.8306664783.

The spelling of 408238865 in words is "four hundred eight million, two hundred thirty-eight thousand, eight hundred sixty-five".