12487678437838 has 4 divisors (see below), whose sum is σ = 18731517656760. Its totient is φ = 6243839218918.

The previous prime is 12487678437833. The next prime is 12487678437859. The reversal of 12487678437838 is 83873487678421.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×12487678437838² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12487678437833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3121919609458 + ... + 3121919609461.

It is an arithmetic number, because the mean of its divisors is an integer number (4682879414190).

Almost surely, 2^{12487678437838} is an apocalyptic number.

12487678437838 is a deficient number, since it is larger than the sum of its proper divisors (6243839218922).

12487678437838 is an equidigital number, since it uses as much as digits as its factorization.

12487678437838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6243839218921.

The product of its digits is 2427715584, while the sum is 76.

The spelling of 12487678437838 in words is "twelve trillion, four hundred eighty-seven billion, six hundred seventy-eight million, four hundred thirty-seven thousand, eight hundred thirty-eight".