1238864647829 has 2 divisors, whose sum is σ = 1238864647830. Its totient is φ = 1238864647828.

The previous prime is 1238864647577. The next prime is 1238864647831. The reversal of 1238864647829 is 9287464688321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1191470487025 + 47394160804 = 1091545^2 + 217702^2 .

It is a cyclic number.

It is not a de Polignac number, because 1238864647829 - 2²⁴ = 1238847870613 is a prime.

Together with 1238864647831, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1238864647859) 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, 619432323914 + 619432323915.

It is an arithmetic number, because the mean of its divisors is an integer number (619432323915).

Almost surely, 2^{1238864647829} is an apocalyptic number.

It is an amenable number.

1238864647829 is a deficient number, since it is larger than the sum of its proper divisors (1).

1238864647829 is an equidigital number, since it uses as much as digits as its factorization.

1238864647829 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 222953472, while the sum is 68.

The spelling of 1238864647829 in words is "one trillion, two hundred thirty-eight billion, eight hundred sixty-four million, six hundred forty-seven thousand, eight hundred twenty-nine".