1278196943 has 4 divisors (see below), whose sum is σ = 1279096608. Its totient is φ = 1277297280.

The previous prime is 1278196903. The next prime is 1278196949. The reversal of 1278196943 is 3496918721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3496918721 = 20477 ⋅170773.

It is a cyclic number.

It is not a de Polignac number, because 1278196943 - 2²⁶ = 1211088079 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1278196891 and 1278196900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278196949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 447698 + ... + 450543.

It is an arithmetic number, because the mean of its divisors is an integer number (319774152).

Almost surely, 2^1278196943 is an apocalyptic number.

1278196943 is a deficient number, since it is larger than the sum of its proper divisors (899665).

1278196943 is an equidigital number, since it uses as much as digits as its factorization.

1278196943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 899664.

The product of its digits is 653184, while the sum is 50.

The square root of 1278196943 is about 35751.8802722318. The cubic root of 1278196943 is about 1085.2569893921.

The spelling of 1278196943 in words is "one billion, two hundred seventy-eight million, one hundred ninety-six thousand, nine hundred forty-three".