400400043941 has 2 divisors, whose sum is σ = 400400043942. Its totient is φ = 400400043940.

The previous prime is 400400043893. The next prime is 400400043977. The reversal of 400400043941 is 149340004004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 389887848100 + 10512195841 = 624410^2 + 102529^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400400043941 is a prime.

It is a super-2 number, since 2×400400043941² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (400400093941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200200021970 + 200200021971.

It is an arithmetic number, because the mean of its divisors is an integer number (200200021971).

Almost surely, 2^400400043941 is an apocalyptic number.

It is an amenable number.

400400043941 is a deficient number, since it is larger than the sum of its proper divisors (1).

400400043941 is an equidigital number, since it uses as much as digits as its factorization.

400400043941 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 29.

Adding to 400400043941 its reverse (149340004004), we get a palindrome (549740047945).

The spelling of 400400043941 in words is "four hundred billion, four hundred million, forty-three thousand, nine hundred forty-one".