400303243 has 2 divisors, whose sum is σ = 400303244. Its totient is φ = 400303242.

The previous prime is 400303237. The next prime is 400303261. The reversal of 400303243 is 342303004.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400303243 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 400303243.

It is not a weakly prime, because it can be changed into another prime (400303283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200151621 + 200151622.

It is an arithmetic number, because the mean of its divisors is an integer number (200151622).

Almost surely, 2^400303243 is an apocalyptic number.

400303243 is a deficient number, since it is larger than the sum of its proper divisors (1).

400303243 is an equidigital number, since it uses as much as digits as its factorization.

400303243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 19.

The square root of 400303243 is about 20007.5796387269. The cubic root of 400303243 is about 736.9924454905.

Adding to 400303243 its reverse (342303004), we get a palindrome (742606247).

The spelling of 400303243 in words is "four hundred million, three hundred three thousand, two hundred forty-three".