1820163 has 4 divisors (see below), whose sum is σ = 2426888. Its totient is φ = 1213440.

The previous prime is 1820153. The next prime is 1820171. The reversal of 1820163 is 3610281.

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

It is not a de Polignac number, because 1820163 - 2⁹ = 1819651 is a prime.

It is a D-number.

It is a Duffinian number.

1820163 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1820123) 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, 303358 + ... + 303363.

It is an arithmetic number, because the mean of its divisors is an integer number (606722).

2^1820163 is an apocalyptic number.

1820163 is a deficient number, since it is larger than the sum of its proper divisors (606725).

1820163 is an equidigital number, since it uses as much as digits as its factorization.

1820163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 606724.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 1820163 is about 1349.1341667899. The cubic root of 1820163 is about 122.0965597642.

The spelling of 1820163 in words is "one million, eight hundred twenty thousand, one hundred sixty-three".