1520720 has 20 divisors (see below), whose sum is σ = 3535860. Its totient is φ = 608256.

The previous prime is 1520719. The next prime is 1520723. The reversal of 1520720 is 270251.

It can be written as a sum of positive squares in 2 ways, for example, as 937024 + 583696 = 968^2 + 764^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1520723) 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, 9425 + ... + 9584.

It is an arithmetic number, because the mean of its divisors is an integer number (176793).

2^1520720 is an apocalyptic number.

1520720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1520720 is an abundant number, since it is smaller than the sum of its proper divisors (2015140).

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

1520720 is a wasteful number, since it uses less digits than its factorization.

1520720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19022 (or 19016 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 17.

The square root of 1520720 is about 1233.1747645812. The cubic root of 1520720 is about 114.9960931250.

Adding to 1520720 its reverse (270251), we get a palindrome (1790971).

The spelling of 1520720 in words is "one million, five hundred twenty thousand, seven hundred twenty".