400440442240 has 32 divisors (see below), whose sum is σ = 957302933760. Its totient is φ = 160176176640.

The previous prime is 400440442229. The next prime is 400440442291. The reversal of 400440442240 is 42244044004.

It is a tau number, because it is divible by the number of its divisors (32).

It is a junction number, because it is equal to n+sod(n) for n = 400440442199 and 400440442208.

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, 312843456 + ... + 312844735.

It is an arithmetic number, because the mean of its divisors is an integer number (29915716680).

Almost surely, 2^400440442240 is an apocalyptic number.

400440442240 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400440442240 is an abundant number, since it is smaller than the sum of its proper divisors (556862491520).

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

400440442240 is an equidigital number, since it uses as much as digits as its factorization.

400440442240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 625688210 (or 625688198 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 28.

Adding to 400440442240 its reverse (42244044004), we get a palindrome (442684486244).

The spelling of 400440442240 in words is "four hundred billion, four hundred forty million, four hundred forty-two thousand, two hundred forty".