401243243 has 2 divisors, whose sum is σ = 401243244. Its totient is φ = 401243242.

The previous prime is 401243237. The next prime is 401243251. The reversal of 401243243 is 342342104.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-401243243 is a prime.

It is a super-2 number, since 2×401243243² = 321992280106314098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (401243233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200621621 + 200621622.

It is an arithmetic number, because the mean of its divisors is an integer number (200621622).

Almost surely, 2^401243243 is an apocalyptic number.

401243243 is a deficient number, since it is larger than the sum of its proper divisors (1).

401243243 is an equidigital number, since it uses as much as digits as its factorization.

401243243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 23.

The square root of 401243243 is about 20031.0569616284. The cubic root of 401243243 is about 737.5688679536.

Adding to 401243243 its reverse (342342104), we get a palindrome (743585347).

The spelling of 401243243 in words is "four hundred one million, two hundred forty-three thousand, two hundred forty-three".