1720423 has 8 divisors (see below), whose sum is σ = 1812096. Its totient is φ = 1630200.

The previous prime is 1720421. The next prime is 1720427. The reversal of 1720423 is 3240271.

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 1720423 - 2¹ = 1720421 is a prime.

It is a d-powerful number, because it can be written as 1 + 7⁶ + 2 + 0 + 4⁴ + 2¹³ + 3¹³ .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1720423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1720421) 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, 2728 + ... + 3298.

It is an arithmetic number, because the mean of its divisors is an integer number (226512).

2^1720423 is an apocalyptic number.

1720423 is a deficient number, since it is larger than the sum of its proper divisors (91673).

1720423 is a wasteful number, since it uses less digits than its factorization.

1720423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 725.

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 1720423 is about 1311.6489621846. The cubic root of 1720423 is about 119.8243494978.

Adding to 1720423 its reverse (3240271), we get a palindrome (4960694).

The spelling of 1720423 in words is "one million, seven hundred twenty thousand, four hundred twenty-three".