1720375 has 8 divisors (see below), whose sum is σ = 2147184. Its totient is φ = 1376200.

The previous prime is 1720363. The next prime is 1720379. The reversal of 1720375 is 5730271.

It is not a de Polignac number, because 1720375 - 2⁹ = 1719863 is a prime.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1720379) 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, 6757 + ... + 7006.

It is an arithmetic number, because the mean of its divisors is an integer number (268398).

2^1720375 is an apocalyptic number.

1720375 is a deficient number, since it is larger than the sum of its proper divisors (426809).

1720375 is an equidigital number, since it uses as much as digits as its factorization.

1720375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13778 (or 13768 counting only the distinct ones).

The product of its (nonzero) digits is 1470, while the sum is 25.

The square root of 1720375 is about 1311.6306644784. The cubic root of 1720375 is about 119.8232351164.

The spelling of 1720375 in words is "one million, seven hundred twenty thousand, three hundred seventy-five".