1720166 has 8 divisors (see below), whose sum is σ = 2948880. Its totient is φ = 737208.

The previous prime is 1720163. The next prime is 1720171. The reversal of 1720166 is 6610271.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1720163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61421 + ... + 61448.

It is an arithmetic number, because the mean of its divisors is an integer number (368610).

2^1720166 is an apocalyptic number.

1720166 is a deficient number, since it is larger than the sum of its proper divisors (1228714).

1720166 is a wasteful number, since it uses less digits than its factorization.

1720166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122878.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 1720166 is about 1311.5509902402. The cubic root of 1720166 is about 119.8183826723.

The spelling of 1720166 in words is "one million, seven hundred twenty thousand, one hundred sixty-six".