2073821 has 4 divisors (see below), whose sum is σ = 2124444. Its totient is φ = 2023200.

The previous prime is 2073811. The next prime is 2073823. The reversal of 2073821 is 1283702.

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

It can be written as a sum of positive squares in 2 ways, for example, as 657721 + 1416100 = 811^2 + 1190^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2073821 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 (2073823) 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, 25250 + ... + 25331.

It is an arithmetic number, because the mean of its divisors is an integer number (531111).

2^2073821 is an apocalyptic number.

It is an amenable number.

2073821 is a deficient number, since it is larger than the sum of its proper divisors (50623).

2073821 is an equidigital number, since it uses as much as digits as its factorization.

2073821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50622.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 2073821 is about 1440.0767340666. The cubic root of 2073821 is about 127.5235583791.

The spelling of 2073821 in words is "two million, seventy-three thousand, eight hundred twenty-one".