1646423 has 2 divisors, whose sum is σ = 1646424. Its totient is φ = 1646422.

The previous prime is 1646413. The next prime is 1646443. The reversal of 1646423 is 3246461.

It is a weak prime.

It is an emirp because it is prime and its reverse (3246461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1646423 - 2¹² = 1642327 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1646392 and 1646401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1646413) 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 as a sum of consecutive naturals, namely, 823211 + 823212.

It is an arithmetic number, because the mean of its divisors is an integer number (823212).

2^1646423 is an apocalyptic number.

1646423 is a deficient number, since it is larger than the sum of its proper divisors (1).

1646423 is an equidigital number, since it uses as much as digits as its factorization.

1646423 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 26.

The square root of 1646423 is about 1283.1301570768. The cubic root of 1646423 is about 118.0811229966.

The spelling of 1646423 in words is "one million, six hundred forty-six thousand, four hundred twenty-three".