1540720 has 20 divisors (see below), whose sum is σ = 3582360. Its totient is φ = 616256.

The previous prime is 1540711. The next prime is 1540751. The reversal of 1540720 is 270451.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9550 + ... + 9709.

It is an arithmetic number, because the mean of its divisors is an integer number (179118).

2^1540720 is an apocalyptic number.

1540720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1540720 is an abundant number, since it is smaller than the sum of its proper divisors (2041640).

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

1540720 is a wasteful number, since it uses less digits than its factorization.

1540720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19272 (or 19266 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 1540720 is about 1241.2574269667. The cubic root of 1540720 is about 115.4980291137.

The spelling of 1540720 in words is "one million, five hundred forty thousand, seven hundred twenty".