1821773 has 4 divisors (see below), whose sum is σ = 1824480. Its totient is φ = 1819068.

The previous prime is 1821763. The next prime is 1821779. The reversal of 1821773 is 3771281.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1821773 - 2⁶ = 1821709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1821779) 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, 536 + ... + 1982.

It is an arithmetic number, because the mean of its divisors is an integer number (456120).

2^1821773 is an apocalyptic number.

It is an amenable number.

1821773 is a deficient number, since it is larger than the sum of its proper divisors (2707).

1821773 is a wasteful number, since it uses less digits than its factorization.

1821773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2706.

The product of its digits is 2352, while the sum is 29.

The square root of 1821773 is about 1349.7307138833. The cubic root of 1821773 is about 122.1325487627.

The spelling of 1821773 in words is "one million, eight hundred twenty-one thousand, seven hundred seventy-three".