408398644 has 24 divisors (see below), whose sum is σ = 722517768. Its totient is φ = 201976320.

The previous prime is 408398629. The next prime is 408398699. The reversal of 408398644 is 446893804.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 34363044 + 374035600 = 5862^2 + 19340^2 .

It is a junction number, because it is equal to n+sod(n) for n = 408398594 and 408398603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 170334 + ... + 172714.

It is an arithmetic number, because the mean of its divisors is an integer number (30104907).

Almost surely, 2^408398644 is an apocalyptic number.

It is an amenable number.

408398644 is a deficient number, since it is larger than the sum of its proper divisors (314119124).

408398644 is a wasteful number, since it uses less digits than its factorization.

408398644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2835 (or 2833 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 46.

The square root of 408398644 is about 20208.8753769229. The cubic root of 408398644 is about 741.9274345815.

The spelling of 408398644 in words is "four hundred eight million, three hundred ninety-eight thousand, six hundred forty-four".