2043845 has 4 divisors (see below), whose sum is σ = 2452620. Its totient is φ = 1635072.

The previous prime is 2043841. The next prime is 2043851. The reversal of 2043845 is 5483402.

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 1079521 + 964324 = 1039^2 + 982^2 .

It is a cyclic number.

It is not a de Polignac number, because 2043845 - 2² = 2043841 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2043841) 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, 204380 + ... + 204389.

It is an arithmetic number, because the mean of its divisors is an integer number (613155).

2^2043845 is an apocalyptic number.

It is an amenable number.

2043845 is a deficient number, since it is larger than the sum of its proper divisors (408775).

2043845 is an equidigital number, since it uses as much as digits as its factorization.

2043845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408774.

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 2043845 is about 1429.6310712908. The cubic root of 2043845 is about 126.9061451361.

The spelling of 2043845 in words is "two million, forty-three thousand, eight hundred forty-five".