1378720 has 48 divisors (see below), whose sum is σ = 3725568. Its totient is φ = 472320.

The previous prime is 1378703. The next prime is 1378721. The reversal of 1378720 is 278731.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (1378721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 505 + ... + 1735.

It is an arithmetic number, because the mean of its divisors is an integer number (77616).

2^1378720 is an apocalyptic number.

1378720 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 1378720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1862784).

1378720 is an abundant number, since it is smaller than the sum of its proper divisors (2346848).

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

1378720 is a wasteful number, since it uses less digits than its factorization.

1378720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1253 (or 1245 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 1378720 is about 1174.1890818774. The cubic root of 1378720 is about 111.2991955127.

The spelling of 1378720 in words is "one million, three hundred seventy-eight thousand, seven hundred twenty".