1271786437898 has 16 divisors (see below), whose sum is σ = 1933876929480. Its totient is φ = 627161377536.

The previous prime is 1271786437897. The next prime is 1271786437903. The reversal of 1271786437898 is 8987346871721.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1270248464809 + 1537973089 = 1127053^2 + 39217^2 .

It is a Smith number, since the sum of its digits (71) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1271786437897) 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 7 ways as a sum of consecutive naturals, for example, 4810286 + ... + 5067782.

Almost surely, 2^{1271786437898} is an apocalyptic number.

1271786437898 is a deficient number, since it is larger than the sum of its proper divisors (662090491582).

1271786437898 is a wasteful number, since it uses less digits than its factorization.

1271786437898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291401.

The product of its digits is 227598336, while the sum is 71.

The spelling of 1271786437898 in words is "one trillion, two hundred seventy-one billion, seven hundred eighty-six million, four hundred thirty-seven thousand, eight hundred ninety-eight".