400040404031 has 2 divisors, whose sum is σ = 400040404032. Its totient is φ = 400040404030.

The previous prime is 400040404021. The next prime is 400040404051. The reversal of 400040404031 is 130404040004.

It is an a-pointer prime, because the next prime (400040404051) can be obtained adding 400040404031 to its sum of digits (20).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 400040404031 - 2¹⁸ = 400040141887 is a prime.

It is a super-2 number, since 2×400040404031² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 400040403994 and 400040404012.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400040404021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200020202015 + 200020202016.

It is an arithmetic number, because the mean of its divisors is an integer number (200020202016).

Almost surely, 2^400040404031 is an apocalyptic number.

400040404031 is a deficient number, since it is larger than the sum of its proper divisors (1).

400040404031 is an equidigital number, since it uses as much as digits as its factorization.

400040404031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 20.

Adding to 400040404031 its reverse (130404040004), we get a palindrome (530444444035).

The spelling of 400040404031 in words is "four hundred billion, forty million, four hundred four thousand, thirty-one".