400003553 has 2 divisors, whose sum is σ = 400003554. Its totient is φ = 400003552.

The previous prime is 400003547. The next prime is 400003579. The reversal of 400003553 is 355300004.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 348494224 + 51509329 = 18668^2 + 7177^2 .

It is a cyclic number.

It is not a de Polignac number, because 400003553 - 2⁸ = 400003297 is a prime.

It is not a weakly prime, because it can be changed into another prime (400003453) 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, 200001776 + 200001777.

It is an arithmetic number, because the mean of its divisors is an integer number (200001777).

Almost surely, 2^400003553 is an apocalyptic number.

It is an amenable number.

400003553 is a deficient number, since it is larger than the sum of its proper divisors (1).

400003553 is an equidigital number, since it uses as much as digits as its factorization.

400003553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 900, while the sum is 20.

The square root of 400003553 is about 20000.0888248028. The cubic root of 400003553 is about 736.8084812823.

Adding to 400003553 its reverse (355300004), we get a palindrome (755303557).

The spelling of 400003553 in words is "four hundred million, three thousand, five hundred fifty-three".