400440044000 has 96 divisors (see below), whose sum is σ = 986222345472. Its totient is φ = 159794880000.

The previous prime is 400440043957. The next prime is 400440044021. The reversal of 400440044000 is 440044004.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1565105 + ... + 1802895.

It is an arithmetic number, because the mean of its divisors is an integer number (10273149432).

Almost surely, 2^400440044000 is an apocalyptic number.

400440044000 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 400440044000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (493111172736).

400440044000 is an abundant number, since it is smaller than the sum of its proper divisors (585782301472).

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

400440044000 is a wasteful number, since it uses less digits than its factorization.

400440044000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238237 (or 238219 counting only the distinct ones).

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

Adding to 400440044000 its reverse (440044004), we get a palindrome (400880088004).

The spelling of 400440044000 in words is "four hundred billion, four hundred forty million, forty-four thousand".