1640326 has 4 divisors (see below), whose sum is σ = 2460492. Its totient is φ = 820162.

The previous prime is 1640323. The next prime is 1640333. The reversal of 1640326 is 6230461.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 1640297 and 1640306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 410080 + ... + 410083.

It is an arithmetic number, because the mean of its divisors is an integer number (615123).

2^1640326 is an apocalyptic number.

1640326 is a deficient number, since it is larger than the sum of its proper divisors (820166).

1640326 is an equidigital number, since it uses as much as digits as its factorization.

1640326 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 820165.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 1640326 is about 1280.7521227779. The cubic root of 1640326 is about 117.9351841685.

Adding to 1640326 its reverse (6230461), we get a palindrome (7870787).

The spelling of 1640326 in words is "one million, six hundred forty thousand, three hundred twenty-six".