400131073 has 2 divisors, whose sum is σ = 400131074. Its totient is φ = 400131072.

The previous prime is 400131071. The next prime is 400131077. The reversal of 400131073 is 370131004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 390931984 + 9199089 = 19772^2 + 3033^2 .

It is a cyclic number.

It is not a de Polignac number, because 400131073 - 2¹ = 400131071 is a prime.

Together with 400131071, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 400131073.

It is not a weakly prime, because it can be changed into another prime (400131071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200065536 + 200065537.

It is an arithmetic number, because the mean of its divisors is an integer number (200065537).

Almost surely, 2^400131073 is an apocalyptic number.

It is an amenable number.

400131073 is a deficient number, since it is larger than the sum of its proper divisors (1).

400131073 is an equidigital number, since it uses as much as digits as its factorization.

400131073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 252, while the sum is 19.

The square root of 400131073 is about 20003.2765566044. The cubic root of 400131073 is about 736.8867704492.

Adding to 400131073 its reverse (370131004), we get a palindrome (770262077).

The spelling of 400131073 in words is "four hundred million, one hundred thirty-one thousand, seventy-three".