1278880 has 24 divisors (see below), whose sum is σ = 3021732. Its totient is φ = 511488.

The previous prime is 1278857. The next prime is 1278881. The reversal of 1278880 is 888721.

It can be written as a sum of positive squares in 2 ways, for example, as 1157776 + 121104 = 1076^2 + 348^2 .

It is not an unprimeable number, because it can be changed into a prime (1278881) 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, 3837 + ... + 4156.

2^1278880 is an apocalyptic number.

1278880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1278880 is an abundant number, since it is smaller than the sum of its proper divisors (1742852).

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

1278880 is an equidigital number, since it uses as much as digits as its factorization.

1278880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8008 (or 8000 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 34.

The square root of 1278880 is about 1130.8757668285. The cubic root of 1278880 is about 108.5450272172.

The spelling of 1278880 in words is "one million, two hundred seventy-eight thousand, eight hundred eighty".