1720055 has 8 divisors (see below), whose sum is σ = 2153952. Its totient is φ = 1316128.

The previous prime is 1720049. The next prime is 1720057. The reversal of 1720055 is 5500271.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1720055 - 2⁴ = 1720039 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1720057) 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, 7364 + ... + 7593.

It is an arithmetic number, because the mean of its divisors is an integer number (269244).

2^1720055 is an apocalyptic number.

1720055 is a deficient number, since it is larger than the sum of its proper divisors (433897).

1720055 is a wasteful number, since it uses less digits than its factorization.

1720055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14985.

The product of its (nonzero) digits is 350, while the sum is 20.

The square root of 1720055 is about 1311.5086732462. The cubic root of 1720055 is about 119.8158053771.

It can be divided in two parts, 17200 and 55, that multiplied together give a triangular number (946000 = T₁₃₇₅).

The spelling of 1720055 in words is "one million, seven hundred twenty thousand, fifty-five".