400544401 has 2 divisors, whose sum is σ = 400544402. Its totient is φ = 400544400.

The previous prime is 400544393. The next prime is 400544407. The reversal of 400544401 is 104445004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 385729600 + 14814801 = 19640^2 + 3849^2 .

It is a cyclic number.

It is not a de Polignac number, because 400544401 - 2³ = 400544393 is a prime.

It is not a weakly prime, because it can be changed into another prime (400544407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200272200 + 200272201.

It is an arithmetic number, because the mean of its divisors is an integer number (200272201).

Almost surely, 2^400544401 is an apocalyptic number.

It is an amenable number.

400544401 is a deficient number, since it is larger than the sum of its proper divisors (1).

400544401 is an equidigital number, since it uses as much as digits as its factorization.

400544401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1280, while the sum is 22.

The square root of 400544401 is about 20013.6053973291. The cubic root of 400544401 is about 737.1404132694.

Adding to 400544401 its reverse (104445004), we get a palindrome (504989405).

The spelling of 400544401 in words is "four hundred million, five hundred forty-four thousand, four hundred one".