1278464 has 40 divisors (see below), whose sum is σ = 2798928. Its totient is φ = 578560.

The previous prime is 1278463. The next prime is 1278467. The reversal of 1278464 is 4648721.

It is a Harshad number since it is a multiple of its sum of digits (32).

Its product of digits (10752) is a multiple of the sum of its prime factors (256).

It is a self number, because there is not a number n which added to its sum of digits gives 1278464.

It is not an unprimeable number, because it can be changed into a prime (1278463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5519 + ... + 5745.

2^1278464 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1278464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1399464).

1278464 is an abundant number, since it is smaller than the sum of its proper divisors (1520464).

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

1278464 is an equidigital number, since it uses as much as digits as its factorization.

1278464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 256 (or 240 counting only the distinct ones).

The product of its digits is 10752, while the sum is 32.

The square root of 1278464 is about 1130.6918236195. The cubic root of 1278464 is about 108.5332565981.

The spelling of 1278464 in words is "one million, two hundred seventy-eight thousand, four hundred sixty-four".