40240243 has 2 divisors, whose sum is σ = 40240244. Its totient is φ = 40240242.

The previous prime is 40240237. The next prime is 40240247. The reversal of 40240243 is 34204204.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40240243 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40240243.

It is not a weakly prime, because it can be changed into another prime (40240247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20120121 + 20120122.

It is an arithmetic number, because the mean of its divisors is an integer number (20120122).

Almost surely, 2^40240243 is an apocalyptic number.

40240243 is a deficient number, since it is larger than the sum of its proper divisors (1).

40240243 is an equidigital number, since it uses as much as digits as its factorization.

40240243 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 19.

The square root of 40240243 is about 6343.5197642949. The cubic root of 40240243 is about 342.6785060575.

Adding to 40240243 its reverse (34204204), we get a palindrome (74444447).

The spelling of 40240243 in words is "forty million, two hundred forty thousand, two hundred forty-three".