1278873 has 6 divisors (see below), whose sum is σ = 1847274. Its totient is φ = 852576.

The previous prime is 1278857. The next prime is 1278881. The reversal of 1278873 is 3788721.

It can be written as a sum of positive squares in only one way, i.e., 974169 + 304704 = 987^2 + 552^2 .

It is not a de Polignac number, because 1278873 - 2⁴ = 1278857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1278803) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 71040 + ... + 71057.

It is an arithmetic number, because the mean of its divisors is an integer number (307879).

2^1278873 is an apocalyptic number.

It is an amenable number.

1278873 is a deficient number, since it is larger than the sum of its proper divisors (568401).

1278873 is a wasteful number, since it uses less digits than its factorization.

1278873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142103 (or 142100 counting only the distinct ones).

The product of its digits is 18816, while the sum is 36.

The square root of 1278873 is about 1130.8726718778. The cubic root of 1278873 is about 108.5448291750.

The spelling of 1278873 in words is "one million, two hundred seventy-eight thousand, eight hundred seventy-three".