1720775 has 12 divisors (see below), whose sum is σ = 2438832. Its totient is φ = 1179840.

The previous prime is 1720769. The next prime is 1720777. The reversal of 1720775 is 5770271.

It is not a de Polignac number, because 1720775 - 2⁶ = 1720711 is a prime.

It is a super-2 number, since 2×1720775² = 5922133201250, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1720777) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4742 + ... + 5091.

It is an arithmetic number, because the mean of its divisors is an integer number (203236).

2^1720775 is an apocalyptic number.

1720775 is a deficient number, since it is larger than the sum of its proper divisors (718057).

1720775 is an equidigital number, since it uses as much as digits as its factorization.

1720775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9850 (or 9845 counting only the distinct ones).

The product of its (nonzero) digits is 3430, while the sum is 29.

The square root of 1720775 is about 1311.7831375650. The cubic root of 1720775 is about 119.8325209949.

The spelling of 1720775 in words is "one million, seven hundred twenty thousand, seven hundred seventy-five".