1278978 has 16 divisors (see below), whose sum is σ = 2708640. Its totient is φ = 401216.

The previous prime is 1278911. The next prime is 1278983. The reversal of 1278978 is 8798721.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6168 + ... + 6371.

It is an arithmetic number, because the mean of its divisors is an integer number (169290).

2^1278978 is an apocalyptic number.

1278978 is an abundant number, since it is smaller than the sum of its proper divisors (1429662).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1278978 is a wasteful number, since it uses less digits than its factorization.

1278978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12561.

The product of its digits is 56448, while the sum is 42.

The square root of 1278978 is about 1130.9190952495. The cubic root of 1278978 is about 108.5477997320.

The spelling of 1278978 in words is "one million, two hundred seventy-eight thousand, nine hundred seventy-eight".