1278794843 has 2 divisors, whose sum is σ = 1278794844. Its totient is φ = 1278794842.

The previous prime is 1278794837. The next prime is 1278794863. The reversal of 1278794843 is 3484978721.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1278794843 - 2⁴ = 1278794827 is a prime.

It is not a weakly prime, because it can be changed into another prime (1278794833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 639397421 + 639397422.

It is an arithmetic number, because the mean of its divisors is an integer number (639397422).

Almost surely, 2^1278794843 is an apocalyptic number.

1278794843 is a deficient number, since it is larger than the sum of its proper divisors (1).

1278794843 is an equidigital number, since it uses as much as digits as its factorization.

1278794843 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2709504, while the sum is 53.

The square root of 1278794843 is about 35760.2410925877. The cubic root of 1278794843 is about 1085.4261792835.

The spelling of 1278794843 in words is "one billion, two hundred seventy-eight million, seven hundred ninety-four thousand, eight hundred forty-three".