1640323 has 2 divisors, whose sum is σ = 1640324. Its totient is φ = 1640322.

The previous prime is 1640311. The next prime is 1640333. The reversal of 1640323 is 3230461.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1640323 - 2⁹ = 1639811 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1640323.

It is not a weakly prime, because it can be changed into another prime (1640333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820161 + 820162.

It is an arithmetic number, because the mean of its divisors is an integer number (820162).

2^1640323 is an apocalyptic number.

1640323 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640323 is an equidigital number, since it uses as much as digits as its factorization.

1640323 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 1640323 is about 1280.7509515905. The cubic root of 1640323 is about 117.9351122710.

Adding to 1640323 its reverse (3230461), we get a palindrome (4870784).

The spelling of 1640323 in words is "one million, six hundred forty thousand, three hundred twenty-three".