400205441 has 2 divisors, whose sum is σ = 400205442. Its totient is φ = 400205440.

The previous prime is 400205401. The next prime is 400205459. The reversal of 400205441 is 144502004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 282374416 + 117831025 = 16804^2 + 10855^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400205441 is a prime.

It is not a weakly prime, because it can be changed into another prime (400205401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200102720 + 200102721.

It is an arithmetic number, because the mean of its divisors is an integer number (200102721).

Almost surely, 2^400205441 is an apocalyptic number.

It is an amenable number.

400205441 is a deficient number, since it is larger than the sum of its proper divisors (1).

400205441 is an equidigital number, since it uses as much as digits as its factorization.

400205441 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 400205441 is about 20005.1353657005. The cubic root of 400205441 is about 736.9324199912.

Adding to 400205441 its reverse (144502004), we get a palindrome (544707445).

The spelling of 400205441 in words is "four hundred million, two hundred five thousand, four hundred forty-one".