400408880840 has 16 divisors (see below), whose sum is σ = 900919981980. Its totient is φ = 160163552320.

The previous prime is 400408880819. The next prime is 400408880849. The reversal of 400408880840 is 48088804004.

It can be written as a sum of positive squares in 2 ways, for example, as 397986863044 + 2422017796 = 630862^2 + 49214^2 .

It is a junction number, because it is equal to n+sod(n) for n = 400408880791 and 400408880800.

It is not an unprimeable number, because it can be changed into a prime (400408880849) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5005110971 + ... + 5005111050.

Almost surely, 2^400408880840 is an apocalyptic number.

400408880840 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400408880840 is an abundant number, since it is smaller than the sum of its proper divisors (500511101140).

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

400408880840 is a wasteful number, since it uses less digits than its factorization.

400408880840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10010222032 (or 10010222028 counting only the distinct ones).

The product of its (nonzero) digits is 262144, while the sum is 44.

The spelling of 400408880840 in words is "four hundred billion, four hundred eight million, eight hundred eighty thousand, eight hundred forty".