1240239829 has 2 divisors, whose sum is σ = 1240239830. Its totient is φ = 1240239828.

The previous prime is 1240239799. The next prime is 1240239853. The reversal of 1240239829 is 9289320421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 974875729 + 265364100 = 31223^2 + 16290^2 .

It is a cyclic number.

It is not a de Polignac number, because 1240239829 - 2¹¹ = 1240237781 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1240239791 and 1240239800.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1240239899) 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, 620119914 + 620119915.

It is an arithmetic number, because the mean of its divisors is an integer number (620119915).

Almost surely, 2^1240239829 is an apocalyptic number.

It is an amenable number.

1240239829 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240239829 is an equidigital number, since it uses as much as digits as its factorization.

1240239829 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 1240239829 is about 35217.0389016453. The cubic root of 1240239829 is about 1074.4063292083.

The spelling of 1240239829 in words is "one billion, two hundred forty million, two hundred thirty-nine thousand, eight hundred twenty-nine".