4000243440 has 40 divisors (see below), whose sum is σ = 12400755408. Its totient is φ = 1066731520.

The previous prime is 4000243439. The next prime is 4000243459. The reversal of 4000243440 is 443420004.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

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, 8333601 + ... + 8334080.

Almost surely, 2^4000243440 is an apocalyptic number.

4000243440 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

4000243440 is an abundant number, since it is smaller than the sum of its proper divisors (8400511968).

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

4000243440 is a wasteful number, since it uses less digits than its factorization.

4000243440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16667697 (or 16667691 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 21.

The square root of 4000243440 is about 63247.4777362702. The cubic root of 4000243440 is about 1587.4332543909.

Adding to 4000243440 its reverse (443420004), we get a palindrome (4443663444).

The spelling of 4000243440 in words is "four billion, two hundred forty-three thousand, four hundred forty".