1720379 has 2 divisors, whose sum is σ = 1720380. Its totient is φ = 1720378.

The previous prime is 1720363. The next prime is 1720399. The reversal of 1720379 is 9730271.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1720379 - 2⁴ = 1720363 is a prime.

It is not a weakly prime, because it can be changed into another prime (1720339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 860189 + 860190.

It is an arithmetic number, because the mean of its divisors is an integer number (860190).

2^1720379 is an apocalyptic number.

1720379 is a deficient number, since it is larger than the sum of its proper divisors (1).

1720379 is an equidigital number, since it uses as much as digits as its factorization.

1720379 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2646, while the sum is 29.

The square root of 1720379 is about 1311.6321892970. The cubic root of 1720379 is about 119.8233279823.

The spelling of 1720379 in words is "one million, seven hundred twenty thousand, three hundred seventy-nine".