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400205401 is a prime number
BaseRepresentation
bin10111110110101…
…010011001011001
31000220001112121021
4113312222121121
51304423033101
6103413442441
712626455411
oct2766523131
91026045537
10400205401
111959a6272
12b2040421
1364bb3c3b
143b219641
15252045a1
hex17daa659

400205401 has 2 divisors, whose sum is σ = 400205402. Its totient is φ = 400205400.

The previous prime is 400205383. The next prime is 400205441. The reversal of 400205401 is 104502004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 244953801 + 155251600 = 15651^2 + 12460^2 .

It is a cyclic number.

It is not a de Polignac number, because 400205401 - 25 = 400205369 is a prime.

It is not a weakly prime, because it can be changed into another prime (400205441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200102700 + 200102701.

It is an arithmetic number, because the mean of its divisors is an integer number (200102701).

Almost surely, 2400205401 is an apocalyptic number.

It is an amenable number.

400205401 is a deficient number, since it is larger than the sum of its proper divisors (1).

400205401 is an equidigital number, since it uses as much as digits as its factorization.

400205401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 400205401 is about 20005.1343659572. The cubic root of 400205401 is about 736.9323954394.

Adding to 400205401 its reverse (104502004), we get a palindrome (504707405).

The spelling of 400205401 in words is "four hundred million, two hundred five thousand, four hundred one".