2043445 has 4 divisors (see below), whose sum is σ = 2452140. Its totient is φ = 1634752.

The previous prime is 2043421. The next prime is 2043449. The reversal of 2043445 is 5443402.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5443402 = 2 ⋅2721701.

It can be written as a sum of positive squares in 2 ways, for example, as 381924 + 1661521 = 618^2 + 1289^2 .

It is a cyclic number.

It is not a de Polignac number, because 2043445 - 2⁵ = 2043413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2043449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 204340 + ... + 204349.

It is an arithmetic number, because the mean of its divisors is an integer number (613035).

2^2043445 is an apocalyptic number.

It is an amenable number.

2043445 is a deficient number, since it is larger than the sum of its proper divisors (408695).

2043445 is an equidigital number, since it uses as much as digits as its factorization.

2043445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408694.

The product of its (nonzero) digits is 1920, while the sum is 22.

The square root of 2043445 is about 1429.4911682134. The cubic root of 2043445 is about 126.8978656808.

Adding to 2043445 its reverse (5443402), we get a palindrome (7486847).

The spelling of 2043445 in words is "two million, forty-three thousand, four hundred forty-five".