400401361 has 2 divisors, whose sum is σ = 400401362. Its totient is φ = 400401360.

The previous prime is 400401359. The next prime is 400401403. The reversal of 400401361 is 163104004.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 318408336 + 81993025 = 17844^2 + 9055^2 .

It is a cyclic number.

It is not a de Polignac number, because 400401361 - 2¹ = 400401359 is a prime.

Together with 400401359, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (400401311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200200680 + 200200681.

It is an arithmetic number, because the mean of its divisors is an integer number (200200681).

Almost surely, 2^400401361 is an apocalyptic number.

It is an amenable number.

400401361 is a deficient number, since it is larger than the sum of its proper divisors (1).

400401361 is an equidigital number, since it uses as much as digits as its factorization.

400401361 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 400401361 is about 20010.0315092206. The cubic root of 400401361 is about 737.0526551096.

Adding to 400401361 its reverse (163104004), we get a palindrome (563505365).

The spelling of 400401361 in words is "four hundred million, four hundred one thousand, three hundred sixty-one".