1340720 has 20 divisors (see below), whose sum is σ = 3117360. Its totient is φ = 536256.

The previous prime is 1340707. The next prime is 1340723. The reversal of 1340720 is 270431.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (1340723) 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, 8300 + ... + 8459.

It is an arithmetic number, because the mean of its divisors is an integer number (155868).

2^1340720 is an apocalyptic number.

1340720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1340720 is an abundant number, since it is smaller than the sum of its proper divisors (1776640).

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

1340720 is a wasteful number, since it uses less digits than its factorization.

1340720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16772 (or 16766 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 17.

The square root of 1340720 is about 1157.8946411483. The cubic root of 1340720 is about 110.2671194084.

Subtracting from 1340720 its sum of digits (17), we obtain a triangular number (1340703 = T₁₆₃₇).

The spelling of 1340720 in words is "one million, three hundred forty thousand, seven hundred twenty".