1720360 has 32 divisors (see below), whose sum is σ = 3969000. Its totient is φ = 670720.

The previous prime is 1720339. The next prime is 1720361. The reversal of 1720360 is 630271.

It can be written as a sum of positive squares in 4 ways, for example, as 1313316 + 407044 = 1146^2 + 638^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1720361) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1116 + ... + 2164.

2^1720360 is an apocalyptic number.

1720360 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 1720360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1984500).

1720360 is an abundant number, since it is smaller than the sum of its proper divisors (2248640).

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

1720360 is a wasteful number, since it uses less digits than its factorization.

1720360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1101 (or 1097 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 19.

The square root of 1720360 is about 1311.6249463928. The cubic root of 1720360 is about 119.8228868679.

It can be divided in two parts, 1720 and 360, that added together give a triangular number (2080 = T₆₄).

The spelling of 1720360 in words is "one million, seven hundred twenty thousand, three hundred sixty".