401240243 has 2 divisors, whose sum is σ = 401240244. Its totient is φ = 401240242.

The previous prime is 401240197. The next prime is 401240251. The reversal of 401240243 is 342042104.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 401240243 - 2²² = 397045939 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (401243243) 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, 200620121 + 200620122.

It is an arithmetic number, because the mean of its divisors is an integer number (200620122).

Almost surely, 2^401240243 is an apocalyptic number.

401240243 is a deficient number, since it is larger than the sum of its proper divisors (1).

401240243 is an equidigital number, since it uses as much as digits as its factorization.

401240243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 401240243 is about 20030.9820777714. The cubic root of 401240243 is about 737.5670297402.

Adding to 401240243 its reverse (342042104), we get a palindrome (743282347).

The spelling of 401240243 in words is "four hundred one million, two hundred forty thousand, two hundred forty-three".