1278283867 has 4 divisors (see below), whose sum is σ = 1460895856. Its totient is φ = 1095671880.

The previous prime is 1278283849. The next prime is 1278283889. The reversal of 1278283867 is 7683828721.

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

It is a cyclic number.

It is not a de Polignac number, because 1278283867 - 2¹⁹ = 1277759579 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1278284867) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91305984 + ... + 91305997.

It is an arithmetic number, because the mean of its divisors is an integer number (365223964).

Almost surely, 2^1278283867 is an apocalyptic number.

1278283867 is a deficient number, since it is larger than the sum of its proper divisors (182611989).

1278283867 is an equidigital number, since it uses as much as digits as its factorization.

1278283867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182611988.

The product of its digits is 1806336, while the sum is 52.

The square root of 1278283867 is about 35753.0959079071. The cubic root of 1278283867 is about 1085.2815898630.

The spelling of 1278283867 in words is "one billion, two hundred seventy-eight million, two hundred eighty-three thousand, eight hundred sixty-seven".