1240245437 has 2 divisors, whose sum is σ = 1240245438. Its totient is φ = 1240245436.

The previous prime is 1240245403. The next prime is 1240245443. The reversal of 1240245437 is 7345420421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1229624356 + 10621081 = 35066^2 + 3259^2 .

It is an emirp because it is prime and its reverse (7345420421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1240245437 - 2¹⁶ = 1240179901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1240245037) 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, 620122718 + 620122719.

It is an arithmetic number, because the mean of its divisors is an integer number (620122719).

Almost surely, 2^1240245437 is an apocalyptic number.

It is an amenable number.

1240245437 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240245437 is an equidigital number, since it uses as much as digits as its factorization.

1240245437 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26880, while the sum is 32.

The square root of 1240245437 is about 35217.1185221051. The cubic root of 1240245437 is about 1074.4079485891.

Adding to 1240245437 its reverse (7345420421), we get a palindrome (8585665858).

The spelling of 1240245437 in words is "one billion, two hundred forty million, two hundred forty-five thousand, four hundred thirty-seven".