1720485 has 48 divisors (see below), whose sum is σ = 3420144. Its totient is φ = 792576.

The previous prime is 1720471. The next prime is 1720513. The reversal of 1720485 is 5840271.

It can be written as a sum of positive squares in 8 ways, for example, as 25281 + 1695204 = 159^2 + 1302^2 .

It is not a de Polignac number, because 1720485 - 2⁶ = 1720421 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9859 + ... + 10031.

It is an arithmetic number, because the mean of its divisors is an integer number (71253).

2^1720485 is an apocalyptic number.

1720485 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1720485 is a deficient number, since it is larger than the sum of its proper divisors (1699659).

1720485 is a wasteful number, since it uses less digits than its factorization.

1720485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214 (or 211 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 1720485 is about 1311.6725963441. The cubic root of 1720485 is about 119.8257888764.

It can be divided in two parts, 17 and 20485, that added together give a palindrome (20502).

The spelling of 1720485 in words is "one million, seven hundred twenty thousand, four hundred eighty-five".