1681323 has 24 divisors (see below), whose sum is σ = 2719488. Its totient is φ = 903408.

The previous prime is 1681321. The next prime is 1681349. The reversal of 1681323 is 3231861.

It is not a de Polignac number, because 1681323 - 2¹ = 1681321 is a prime.

1681323 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1681293 and 1681302.

It is not an unprimeable number, because it can be changed into a prime (1681321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28468 + ... + 28526.

It is an arithmetic number, because the mean of its divisors is an integer number (113312).

2^1681323 is an apocalyptic number.

1681323 is a deficient number, since it is larger than the sum of its proper divisors (1038165).

1681323 is an equidigital number, since it uses as much as digits as its factorization.

1681323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151 (or 92 counting only the distinct ones).

The product of its digits is 864, while the sum is 24.

The square root of 1681323 is about 1296.6583975743. The cubic root of 1681323 is about 118.9096364576.

It can be divided in two parts, 16813 and 23, that added together give a triangular number (16836 = T₁₈₃).

The spelling of 1681323 in words is "one million, six hundred eighty-one thousand, three hundred twenty-three".