2044400040 has 128 divisors (see below), whose sum is σ = 6908284800. Its totient is φ = 537684480.

The previous prime is 2044400021. The next prime is 2044400047. The reversal of 2044400040 is 400044402.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 2044399986 and 2044400022.

It is not an unprimeable number, because it can be changed into a prime (2044400047) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 65875 + ... + 91805.

It is an arithmetic number, because the mean of its divisors is an integer number (53970975).

Almost surely, 2^2044400040 is an apocalyptic number.

2044400040 is a gapful number since it is divisible by the number (20) 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 2044400040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3454142400).

2044400040 is an abundant number, since it is smaller than the sum of its proper divisors (4863884760).

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

2044400040 is a wasteful number, since it uses less digits than its factorization.

2044400040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26024 (or 26014 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 18.

The square root of 2044400040 is about 45215.0421873075. The cubic root of 2044400040 is about 1269.1763191899.

Adding to 2044400040 its reverse (400044402), we get a palindrome (2444444442).

The spelling of 2044400040 in words is "two billion, forty-four million, four hundred thousand, forty".