4000400005 has 32 divisors (see below), whose sum is σ = 5780496384. Its totient is φ = 2598336576.

The previous prime is 4000399981. The next prime is 4000400023. The reversal of 4000400005 is 5000040004.

It is a cyclic number.

It is not a de Polignac number, because 4000400005 - 2¹¹ = 4000397957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 58792 + ... + 107038.

It is an arithmetic number, because the mean of its divisors is an integer number (180640512).

Almost surely, 2^4000400005 is an apocalyptic number.

It is an amenable number.

4000400005 is a deficient number, since it is larger than the sum of its proper divisors (1780096379).

4000400005 is a wasteful number, since it uses less digits than its factorization.

4000400005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48385.

The product of its (nonzero) digits is 80, while the sum is 13.

The square root of 4000400005 is about 63248.7154415013. The cubic root of 4000400005 is about 1587.4539642343.

Adding to 4000400005 its reverse (5000040004), we get a palindrome (9000440009).

The spelling of 4000400005 in words is "four billion, four hundred thousand, five".