2821723 has 4 divisors (see below), whose sum is σ = 2846808. Its totient is φ = 2796640.

The previous prime is 2821717. The next prime is 2821733. The reversal of 2821723 is 3271282.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2821723 is a prime.

It is a Duffinian number.

2821723 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2821733) 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, 12373 + ... + 12598.

It is an arithmetic number, because the mean of its divisors is an integer number (711702).

2^2821723 is an apocalyptic number.

2821723 is a deficient number, since it is larger than the sum of its proper divisors (25085).

2821723 is a wasteful number, since it uses less digits than its factorization.

2821723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25084.

The product of its digits is 1344, while the sum is 25.

The square root of 2821723 is about 1679.7984998207. The cubic root of 2821723 is about 141.3095324276.

The spelling of 2821723 in words is "two million, eight hundred twenty-one thousand, seven hundred twenty-three".