408020820440 has 16 divisors (see below), whose sum is σ = 918046846080. Its totient is φ = 163208328160.

The previous prime is 408020820421. The next prime is 408020820451. The reversal of 408020820440 is 44028020804.

It is a junction number, because it is equal to n+sod(n) for n = 408020820397 and 408020820406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5100260216 + ... + 5100260295.

It is an arithmetic number, because the mean of its divisors is an integer number (57377927880).

Almost surely, 2^408020820440 is an apocalyptic number.

408020820440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

408020820440 is an abundant number, since it is smaller than the sum of its proper divisors (510026025640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

408020820440 is a wasteful number, since it uses less digits than its factorization.

408020820440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10200520522 (or 10200520518 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 32.

The spelling of 408020820440 in words is "four hundred eight billion, twenty million, eight hundred twenty thousand, four hundred forty".