2043649 has 4 divisors (see below), whose sum is σ = 2055636. Its totient is φ = 2031664.

The previous prime is 2043647. The next prime is 2043673. The reversal of 2043649 is 9463402.

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 1392400 + 651249 = 1180^2 + 807^2 .

It is a cyclic number.

It is not a de Polignac number, because 2043649 - 2¹ = 2043647 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2043647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5734 + ... + 6079.

It is an arithmetic number, because the mean of its divisors is an integer number (513909).

2^2043649 is an apocalyptic number.

It is an amenable number.

2043649 is a deficient number, since it is larger than the sum of its proper divisors (11987).

2043649 is a wasteful number, since it uses less digits than its factorization.

2043649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11986.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 2043649 is about 1429.5625204936. The cubic root of 2043649 is about 126.9020883380.

The spelling of 2043649 in words is "two million, forty-three thousand, six hundred forty-nine".