1821963 has 32 divisors (see below), whose sum is σ = 2967552. Its totient is φ = 979200.

The previous prime is 1821959. The next prime is 1821997. The reversal of 1821963 is 3691281.

It is not a de Polignac number, because 1821963 - 2² = 1821959 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1821963.

It is not an unprimeable number, because it can be changed into a prime (1821913) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13231 + ... + 13367.

It is an arithmetic number, because the mean of its divisors is an integer number (92736).

2^1821963 is an apocalyptic number.

1821963 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1821963 is a deficient number, since it is larger than the sum of its proper divisors (1145589).

1821963 is a wasteful number, since it uses less digits than its factorization.

1821963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195.

The product of its digits is 2592, while the sum is 30.

The square root of 1821963 is about 1349.8010964583. The cubic root of 1821963 is about 122.1367945126.

It can be divided in two parts, 182 and 1963, that added together give a triangular number (2145 = T₆₅).

The spelling of 1821963 in words is "one million, eight hundred twenty-one thousand, nine hundred sixty-three".