400044004040 has 32 divisors (see below), whose sum is σ = 906059943360. Its totient is φ = 158957880000.

The previous prime is 400044004037. The next prime is 400044004057. The reversal of 400044004040 is 40400440004.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33110186 + ... + 33122265.

It is an arithmetic number, because the mean of its divisors is an integer number (28314373230).

Almost surely, 2^400044004040 is an apocalyptic number.

400044004040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

400044004040 is an abundant number, since it is smaller than the sum of its proper divisors (506015939320).

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

400044004040 is a wasteful number, since it uses less digits than its factorization.

400044004040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66232613 (or 66232609 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 20.

Adding to 400044004040 its reverse (40400440004), we get a palindrome (440444444044).

The spelling of 400044004040 in words is "four hundred billion, forty-four million, four thousand, forty".