1240020437 has 2 divisors, whose sum is σ = 1240020438. Its totient is φ = 1240020436.

The previous prime is 1240020407. The next prime is 1240020451. The reversal of 1240020437 is 7340200421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1236155281 + 3865156 = 35159^2 + 1966^2 .

It is a cyclic number.

It is not a de Polignac number, because 1240020437 - 2⁶ = 1240020373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1240020407) 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, 620010218 + 620010219.

It is an arithmetic number, because the mean of its divisors is an integer number (620010219).

Almost surely, 2^1240020437 is an apocalyptic number.

It is an amenable number.

1240020437 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240020437 is an equidigital number, since it uses as much as digits as its factorization.

1240020437 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1344, while the sum is 23.

The square root of 1240020437 is about 35213.9239080225. The cubic root of 1240020437 is about 1074.3429731680.

Adding to 1240020437 its reverse (7340200421), we get a palindrome (8580220858).

The spelling of 1240020437 in words is "one billion, two hundred forty million, twenty thousand, four hundred thirty-seven".