1620843323 has 4 divisors (see below), whose sum is σ = 1768192728. Its totient is φ = 1473493920.

The previous prime is 1620843311. The next prime is 1620843337. The reversal of 1620843323 is 3233480261.

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

It is a cyclic number.

It is not a de Polignac number, because 1620843323 - 2¹⁶ = 1620777787 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1620843323.

It is not an unprimeable number, because it can be changed into a prime (1620843353) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73674686 + ... + 73674707.

It is an arithmetic number, because the mean of its divisors is an integer number (442048182).

Almost surely, 2^1620843323 is an apocalyptic number.

1620843323 is a deficient number, since it is larger than the sum of its proper divisors (147349405).

1620843323 is a wasteful number, since it uses less digits than its factorization.

1620843323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147349404.

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 1620843323 is about 40259.6984961388. The cubic root of 1620843323 is about 1174.6640531656.

The spelling of 1620843323 in words is "one billion, six hundred twenty million, eight hundred forty-three thousand, three hundred twenty-three".