400440120040 has 16 divisors (see below), whose sum is σ = 900990270180. Its totient is φ = 160176048000.

The previous prime is 400440120013. The next prime is 400440120049. The reversal of 400440120040 is 40021044004.

It can be written as a sum of positive squares in 2 ways, for example, as 375197901156 + 25242218884 = 612534^2 + 158878^2 .

It is not an unprimeable number, because it can be changed into a prime (400440120049) 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, 5005501461 + ... + 5005501540.

Almost surely, 2^400440120040 is an apocalyptic number.

400440120040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400440120040 is an abundant number, since it is smaller than the sum of its proper divisors (500550150140).

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

400440120040 is a wasteful number, since it uses less digits than its factorization.

400440120040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10011003012 (or 10011003008 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 19.

Adding to 400440120040 its reverse (40021044004), we get a palindrome (440461164044).

The spelling of 400440120040 in words is "four hundred billion, four hundred forty million, one hundred twenty thousand, forty".