1278720 has 144 divisors (see below), whose sum is σ = 4660320. Its totient is φ = 331776.

The previous prime is 1278713. The next prime is 1278721. The reversal of 1278720 is 278721.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1278721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34542 + ... + 34578.

2^1278720 is an apocalyptic number.

1278720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1278720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2330160).

1278720 is an abundant number, since it is smaller than the sum of its proper divisors (3381600).

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

1278720 is an equidigital number, since it uses as much as digits as its factorization.

1278720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67 (or 47 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 27.

The square root of 1278720 is about 1130.8050229814. The cubic root of 1278720 is about 108.5405003581.

Subtracting from 1278720 its reverse (278721), we obtain a palindrome (999999).

The spelling of 1278720 in words is "one million, two hundred seventy-eight thousand, seven hundred twenty".