408644220440 has 64 divisors (see below), whose sum is σ = 973724016960. Its totient is φ = 153812623360.

The previous prime is 408644220421. The next prime is 408644220521. The reversal of 408644220440 is 44022446804.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 408644220394 and 408644220403.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3611525 + ... + 3722955.

It is an arithmetic number, because the mean of its divisors is an integer number (15214437765).

Almost surely, 2^408644220440 is an apocalyptic number.

408644220440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

408644220440 is an abundant number, since it is smaller than the sum of its proper divisors (565079796520).

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

408644220440 is a wasteful number, since it uses less digits than its factorization.

408644220440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116852 (or 116848 counting only the distinct ones).

The product of its (nonzero) digits is 196608, while the sum is 38.

The spelling of 408644220440 in words is "four hundred eight billion, six hundred forty-four million, two hundred twenty thousand, four hundred forty".