1238834447866 has 8 divisors (see below), whose sum is σ = 1858272561684. Its totient is φ = 619410260640.

The previous prime is 1238834447863. The next prime is 1238834447887. The reversal of 1238834447866 is 6687444388321.

It can be written as a sum of positive squares in 2 ways, for example, as 1238833554841 + 893025 = 1113029^2 + 945^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 1238834447798 and 1238834447807.

It is not an unprimeable number, because it can be changed into a prime (1238834447863) 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 in 3 ways as a sum of consecutive naturals, for example, 3256345 + ... + 3616828.

Almost surely, 2^{1238834447866} is an apocalyptic number.

1238834447866 is a deficient number, since it is larger than the sum of its proper divisors (619438113818).

1238834447866 is an equidigital number, since it uses as much as digits as its factorization.

1238834447866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6963296.

The product of its digits is 148635648, while the sum is 64.

The spelling of 1238834447866 in words is "one trillion, two hundred thirty-eight billion, eight hundred thirty-four million, four hundred forty-seven thousand, eight hundred sixty-six".