400000020000005 has 16 divisors (see below), whose sum is σ = 480244582014960. Its totient is φ = 319837015314432.

The previous prime is 400000019999981. The next prime is 400000020000023. The reversal of 400000020000005 is 500000020000004.

It can be written as a sum of positive squares in 8 ways, for example, as 1560055956484 + 398439964043521 = 1249022^2 + 19960961^2 .

It is a cyclic number.

It is not a de Polignac number, because 400000020000005 - 2¹⁸ = 400000019737861 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82012901 + ... + 86753189.

It is an arithmetic number, because the mean of its divisors is an integer number (30015286375935).

Almost surely, 2^{400000020000005} is an apocalyptic number.

It is an amenable number.

400000020000005 is a deficient number, since it is larger than the sum of its proper divisors (80244562014955).

400000020000005 is a wasteful number, since it uses less digits than its factorization.

400000020000005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4748888.

The product of its (nonzero) digits is 40, while the sum is 11.

Adding to 400000020000005 its reverse (500000020000004), we get a palindrome (900000040000009).

Subtracting 400000020000005 from its reverse (500000020000004), we obtain a palindrome (99999999999999).

The spelling of 400000020000005 in words is "four hundred trillion, twenty million, five", and thus it is an aban number.