400444481 has 2 divisors, whose sum is σ = 400444482. Its totient is φ = 400444480.

The previous prime is 400444477. The next prime is 400444487. The reversal of 400444481 is 184444004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 392832400 + 7612081 = 19820^2 + 2759^2 .

It is a cyclic number.

It is not a de Polignac number, because 400444481 - 2² = 400444477 is a prime.

It is a super-2 number, since 2×400444481² = 320711564726718722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (400444487) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200222240 + 200222241.

It is an arithmetic number, because the mean of its divisors is an integer number (200222241).

Almost surely, 2^400444481 is an apocalyptic number.

It is an amenable number.

400444481 is a deficient number, since it is larger than the sum of its proper divisors (1).

400444481 is an equidigital number, since it uses as much as digits as its factorization.

400444481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8192, while the sum is 29.

The square root of 400444481 is about 20011.1089397864. The cubic root of 400444481 is about 737.0791123704.

Adding to 400444481 its reverse (184444004), we get a palindrome (584888485).

The spelling of 400444481 in words is "four hundred million, four hundred forty-four thousand, four hundred eighty-one".