400444404040 has 16 divisors (see below), whose sum is σ = 900999909180. Its totient is φ = 160177761600.

The previous prime is 400444404001. The next prime is 400444404079. The reversal of 400444404040 is 40404444004.

It is an interprime number because it is at equal distance from previous prime (400444404001) and next prime (400444404079).

It can be written as a sum of positive squares in 2 ways, for example, as 336239939044 + 64204464996 = 579862^2 + 253386^2 .

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, 5005555011 + ... + 5005555090.

Almost surely, 2^400444404040 is an apocalyptic number.

400444404040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400444404040 is an abundant number, since it is smaller than the sum of its proper divisors (500555505140).

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

400444404040 is a wasteful number, since it uses less digits than its factorization.

400444404040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10011110112 (or 10011110108 counting only the distinct ones).

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

Adding to 400444404040 its reverse (40404444004), we get a palindrome (440848848044).

The spelling of 400444404040 in words is "four hundred billion, four hundred forty-four million, four hundred four thousand, forty".