2049809 has 4 divisors (see below), whose sum is σ = 2170404. Its totient is φ = 1929216.

The previous prime is 2049797. The next prime is 2049821. The reversal of 2049809 is 9089402.

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

It is an interprime number because it is at equal distance from previous prime (2049797) and next prime (2049821).

It can be written as a sum of positive squares in 2 ways, for example, as 846400 + 1203409 = 920^2 + 1097^2 .

It is a cyclic number.

It is not a de Polignac number, because 2049809 - 2¹² = 2045713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2049409) 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, 60272 + ... + 60305.

It is an arithmetic number, because the mean of its divisors is an integer number (542601).

2^2049809 is an apocalyptic number.

It is an amenable number.

2049809 is a deficient number, since it is larger than the sum of its proper divisors (120595).

2049809 is a wasteful number, since it uses less digits than its factorization.

2049809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120594.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 2049809 is about 1431.7154046807. The cubic root of 2049809 is about 127.0294638895.

The spelling of 2049809 in words is "two million, forty-nine thousand, eight hundred nine".