1240345429 has 2 divisors, whose sum is σ = 1240345430. Its totient is φ = 1240345428.

The previous prime is 1240345427. The next prime is 1240345459. The reversal of 1240345429 is 9245430421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1237421329 + 2924100 = 35177^2 + 1710^2 .

It is a cyclic number.

It is not a de Polignac number, because 1240345429 - 2¹ = 1240345427 is a prime.

Together with 1240345427, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1240345394 and 1240345403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1240345423) 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, 620172714 + 620172715.

It is an arithmetic number, because the mean of its divisors is an integer number (620172715).

Almost surely, 2^1240345429 is an apocalyptic number.

It is an amenable number.

1240345429 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240345429 is an equidigital number, since it uses as much as digits as its factorization.

1240345429 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 1240345429 is about 35218.5381439946. The cubic root of 1240345429 is about 1074.4368217216.

The spelling of 1240345429 in words is "one billion, two hundred forty million, three hundred forty-five thousand, four hundred twenty-nine".