408978817 has 6 divisors (see below), whose sum is σ = 442858902. Its totient is φ = 377518752.

The previous prime is 408978803. The next prime is 408978827. The reversal of 408978817 is 718879804.

It can be written as a sum of positive squares in 3 ways, for example, as 1100401 + 407878416 = 1049^2 + 20196^2 .

It is a de Polignac number, because none of the positive numbers 2^k-408978817 is a prime.

It is a super-3 number, since 3×408978817³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (408978827) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1209828 + ... + 1210165.

It is an arithmetic number, because the mean of its divisors is an integer number (73809817).

Almost surely, 2^408978817 is an apocalyptic number.

It is an amenable number.

408978817 is a deficient number, since it is larger than the sum of its proper divisors (33880085).

408978817 is a wasteful number, since it uses less digits than its factorization.

408978817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2420019 (or 2420006 counting only the distinct ones).

The product of its (nonzero) digits is 903168, while the sum is 52.

The square root of 408978817 is about 20223.2246934063. The cubic root of 408978817 is about 742.2785968599.

The spelling of 408978817 in words is "four hundred eight million, nine hundred seventy-eight thousand, eight hundred seventeen".