4000400440 has 32 divisors (see below), whose sum is σ = 9085031280. Its totient is φ = 1585203712.

The previous prime is 4000400329. The next prime is 4000400449. The reversal of 4000400440 is 440040004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4000400449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 463057 + ... + 471616.

Almost surely, 2^4000400440 is an apocalyptic number.

4000400440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

4000400440 is an abundant number, since it is smaller than the sum of its proper divisors (5084630840).

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

4000400440 is a wasteful number, since it uses less digits than its factorization.

4000400440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 934791 (or 934787 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 16.

The square root of 4000400440 is about 63248.7188803062. The cubic root of 4000400440 is about 1587.4540217737.

Adding to 4000400440 its reverse (440040004), we get a palindrome (4440440444).

The spelling of 4000400440 in words is "four billion, four hundred thousand, four hundred forty".