4000000005 has 24 divisors (see below), whose sum is σ = 6960975840. Its totient is φ = 2124828000.

The previous prime is 3999999979. The next prime is 4000000007. The reversal of 4000000005 is 5000000004.

It is a de Polignac number, because none of the positive numbers 2^k-4000000005 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4000000007) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 165775 + ... + 188364.

It is an arithmetic number, because the mean of its divisors is an integer number (290040660).

Almost surely, 2^4000000005 is an apocalyptic number.

4000000005 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

4000000005 is a deficient number, since it is larger than the sum of its proper divisors (2960975835).

4000000005 is a wasteful number, since it uses less digits than its factorization.

4000000005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354401 (or 354398 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 9.

The square root of 4000000005 is about 63245.5532428961. The cubic root of 4000000005 is about 1587.4010526296.

Adding to 4000000005 its reverse (5000000004), we get a palindrome (9000000009).

Subtracting 4000000005 from its reverse (5000000004), we obtain a palindrome (999999999).

The spelling of 4000000005 in words is "four billion, five", and thus it is an aban number.