1720323 has 12 divisors (see below), whose sum is σ = 2710968. Its totient is φ = 1042560.

The previous prime is 1720321. The next prime is 1720339. The reversal of 1720323 is 3230271.

It is not a de Polignac number, because 1720323 - 2¹ = 1720321 is a prime.

It is a super-2 number, since 2×1720323² = 5919022448658, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1720296 and 1720305.

It is not an unprimeable number, because it can be changed into a prime (1720321) 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, 8590 + ... + 8787.

It is an arithmetic number, because the mean of its divisors is an integer number (225914).

2^1720323 is an apocalyptic number.

1720323 is a deficient number, since it is larger than the sum of its proper divisors (990645).

1720323 is a wasteful number, since it uses less digits than its factorization.

1720323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17394 (or 17391 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 18.

The square root of 1720323 is about 1311.6108416752. The cubic root of 1720323 is about 119.8220278464.

Adding to 1720323 its reverse (3230271), we get a palindrome (4950594).

The spelling of 1720323 in words is "one million, seven hundred twenty thousand, three hundred twenty-three".